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JavaScript下部分--头歌（educoder）实训作业题目及答案(javascript局部变量)
编辑：rootadminJavaScript下部分--头歌（educoder）实训作业题目及答案
JSON第1关: JSON对象function mainJs(a,b,c) { //请在此处编写代码/********** Begin **********/ var JSONObject = {"key1":a,"key2":b,"key3":c};//定义JSON对象 delete JSONObject.key3;//删除名字为key3的属性var result = "";for(var att in JSONObject) {//遍历剩余所有的属性result = result+JSONObject[att]+",";}return result.slice(0,-1); /********** End **********/}第2关: JSON数组var myJson = {"category":"computer","detail":"programming","language":["js","java","php","python","c"]}function mainJs(a) {a = parseInt(a); //请在此处编写代码/********** Begin **********/ var result = ""; for(var i = 0;i < a;i++) { result = result+myJson.language[i]+","; } return result.slice(0,-1); /********** End **********/}第3关: JSON字符串var JSONString = '{"key1":"value1","key2":"value2"}';function mainJs(a) { //请在此处编写代码/********** Begin **********///JSON字符串转换为JSON对象 var JSONObject = JSON.parse(JSONString);//修改key1属性的值为参数aJSONObject.key1 = a;//JSON对象转换为JSON字符串并返回 return JSON.stringify(JSONObject); /********** End **********/}Math、日期和异常处理第1关: Math类function mainJs(a) { a = parseInt(a); //请在此处编写代码/********** Begin **********/ var b = Math.ceil(a); var c = Math.floor(a); var d = Math.sqrt(a); var e = Math.round(a); var f = Math.sin(a); return Math.max(b,c,d,e,f)+Math.min(b,c,d,e,f); /********** End **********/}第2关: Date类function mainJs(a) { a = parseInt(a); var date = new Date(a); //请在此处编写代码/********** Begin **********/ var year = date.getFullYear(); var month = date.getMonth(); var cal = date.getDate(); var day = date.getDay(); return year+","+month+","+cal+","+day; /********** End **********/}第3关: JavaScript错误function mainJs(a) { //请在此处编写代码/********** Begin **********/ try { if(a < 0) throw new Error("negative cannot be rooted"); if(a == 0) throw new Error("zero cannot be numerator"); return 1/(Math.sqrt(a)); }catch(err) { return err.message; } /********** End **********/}HTML DOM——文档元素的操作（一）第1关: 通过id获取文档元素<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>get element by id</title></head><body> <a id="a1" src="https://www.google.com">Google</a> <p id="p1">this is a text</p> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var myElement = document.getElementById("a1"); <!---------End---------> myElement.href="https://www.educoder.net"; </script></body></html>第2关: 通过类名获取文档元素<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>get element by name</title></head><body> <img src="" class="myName"/> <form class="myName" id="myForm"></form> <q class="myName">This is quote</q> <p class="myName">This is what you should get</p> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var myElement = document.getElementsByClassName("myName")[3]; <!---------End---------> myElement.innerText="I changed the text"; </script></body></html>第3关: 通过标签名获取文档元素<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>get element by id</title></head><body> <div class="diva"> <a href="https://www.educoder.net">EduCoder</a> <a href="https://www.facebook.com">FaceBook</a> </div> <div class="divb"> <a href="https://www.twitter.com">Twitter</a> <form name="myForm"></form> <a href="https://www.nudt.edu.cn">NUDT</a> </div> <p id="pp">this is a text</p><script><!-- 请在此处编写代码 --> <!---------Begin---------> var temp= document.getElementsByTagName("div")[1]; var myElement = temp.getElementsByTagName("a")[1]; <!---------End---------> myElement.innerText="nudt";</script></body></html>第4关: html5中获取元素的方法一<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <p>你需要获得的元素是我</p> <p>是楼上</p> <p>是楼上的楼上</p> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var pElement = document.querySelector("p"); <!---------End---------> console.log(pElement); </script></body></html>第5关: html5中获取元素的方法二<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <p>你需要获得的元素是我</p> <p>包括我</p> <p>还有我</p> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var pElement = document.querySelectorAll("p"); <!---------End---------> console.log(pElement); </script></body></html>第6关: 节点树上的操作<html><head><title>myTitle</title><meta charset="UTF-8"></head><body><div id="div1"><div class="cl1"><p>文本</p><a>超链接</a></div><div class="cl2"><select><option>红</option><option>黄</option><option>蓝</option></select></div></div> <script> var cl2 = document.getElementById("div1").lastElementChild; <!-- 请在此处编写代码 --> <!---------Begin---------> var myElement = cl2.firstElementChild.children[1]; <!---------End---------> myElement.innerText = "绿"; </script></body></html>第7关: 属性值的获取<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <p id="p"></p> <img class="imgClass"/> <a id="a"></a> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var myElement = document.getElementsByClassName("imgClass")[0]; var srcValue = myElement.className; <!---------End---------> console.log(srcValue); </script></body></html>第8关: 属性值的设置<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <p id="p"></p> <form id="form1" method="get" target="https://abc.xyz/def/ghi">This is form</form> <a id="a"></a> <script><!-- 请在此处编写代码 --> <!---------Begin--------->var myElement = document.getElementById("form1");myElement.method = "post"; <!---------End---------> console.log(document.getElementById("form1").method); </script></body></html>HTML DOM——文档元素的操作（二）第1关: 创建节点<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <p></p> <script> <!-- 请在此处编写代码 --> <!---------Begin---------> var newNode = document.createElement("form"); newNode.method = "post"; newNode.id = "myForm"; <!---------End--------->document.body.appendChild(newNode); console.log(newNode.method); </script></body></html>第2关: 插入节点<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <ul id="ul1"> <li>America</li> <li>Mexio</li> </ul> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var newNode = document.createElement("li"); newNode.innerText = "Canada"; document.getElementById("ul1").appendChild(newNode); <!---------End---------> var out = document.getElementsByTagName("li")[2]; console.log(out.innerText); </script></body></html>第3关: 删除节点<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <ol id="browser"> <li id="chrome">Chrome</li> <li id="firefox">Firefox</li> <li id="opera">Opera</li> <li id="safari">Safari</li> </ol> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var parent = document.getElementById("browser"); var child = document.getElementById("opera"); parent.removeChild(child); <!---------End---------> </script></body></html>第4关: 替换节点<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <ol id="parent"> <a id="old" href="https://www.google.com">Google</a> </ol> <script> var newChild = document.createElement("a"); newChild.innerText = "eduCoder"; newChild.href = "https://www.educoder.net";<!-- 请在此处编写代码 --> <!---------Begin---------> var parent = document.getElementById("parent"); var old = document.getElementById("old"); parent.replaceChild(newChild,old); <!---------End---------> </script></body></html>第5关: 综合练习<html><head><title>myTitle</title><meta charset="utf-8" /></head><body><select id="province" onChange="changeCity()"><option value="BeiJing" id="bj">北京</option> <option value="AnHui" id="ah">安徽</option></select><select id="city"> <option value="BeiJingCity">北京市</option></select><script>function changeCity() { var province = document.getElementById("province"); var city = document.getElementById("city"); var length = city.children.length; for(var i = length-1;i >= 0;i--) { city.removeChild(city.children[i]); } if(province.value == "BeiJing") { var child1 = document.createElement("option"); child1.value="BeiJingCity"; child1.innerText="北京市" city.appendChild(child1); } else { var child1 = document.createElement("option"); child1.value="HuangShanCity"; child1.innerText="黄山市"; city.appendChild(child1);//请在此处编写代码 /*********Begin*********/ var child2 = document.createElement("option"); child2.value="HeFeiCity"; child2.innerText="合肥市"; city.appendChild(child2); /*********End*********/ }}</script></body></html>事件处理第1关: 注册事件处理程序<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <button id="button1" onclick="listenButton1()">按钮1</button> <button id="button2">按钮2</button> <button id="button3">按钮3</button> <script> function listenButton1() { console.log("监听button1"); } function listenButton2() { console.log("监听button2"); } function listenButton3() { console.log("监听button3"); }//请在此处编写代码 /********** Begin **********/ var button2 = document.getElementById("button2"); button2.onclick = listenButton2; var button3 = document.getElementById("button3"); button3.addEventListener("click",listenButton3); /********** End **********/ </script></body></html>第2关: 文档加载事件<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body onload="loadEvent()"> <script> function loadEvent() {//请在此处编写代码/********** Begin **********/console.log("Welcome!");/********** End **********/} </script></body></html>第3关: 鼠标事件<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p id="p"> text </p> <button id="but"> button </button> <script> //请在此处编写代码/********** Begin **********/var myButton = document.getElementById("but"); myButton.addEventListener("click",function() { var myElement = document.getElementById("p"); myElement.innerText="clicked"; }) /********** End **********/ </script></body></html>第4关: 键盘事件<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body onkeypress="pressEvent(event)"> <script> function pressEvent(event) {//请在此处编写代码/********** Begin **********/ var code = event.which; if (code == 13) { console.log("cannot use enter"); }/********** End **********/ } </script> </body></html>第5关: 表单事件<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <form> <input id="input" type="text" onchange="changeEvent()" /> <input id="input2" type="text" /> </form> <script> function changeEvent() { //请在此处编写代码/********** Begin **********/ var ele = document.getElementById("input"); var len = ele.value.length; if (len <= 12) { console.log("too short input"); } /********** End **********/ } </script></body></html>第6关: 拖动事件<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <div><!-- 请在此处编写代码 --> <!---------Begin---------> <p ondrag="dragging(event)" id="p1" draggable="true">drag me</p> <!---------End---------> </div> <script> function dragging(event) { /********** Begin **********/ console.log(event.target.innerText); /********** End **********/ } </script> </body></html>第7关: 事件冒泡<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <div id="div1" onclick="click1()"> <div id="div2" onclick="click2()"> <p id="p" onclick="click3()">click me!</p> </div> </div> <script> function click1() { console.log("root"); } function click2() { //请在此处编写代码/********** Begin **********/ window.event?window.event.cancelBubble=true:event.stopPropagation(); /********** End **********/ console.log("parent"); } function click3() { console.log("child"); } </script></body></html>浏览器对象模型第1关: 定时器<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p onclick="handleTimer()">set timer then undo</p> <script> var timeId; function timerTask() { console.log("this is timer task"); } function handleTimer() { //请在此处编写代码/********** Begin **********/ timeId = window.setTimeout(timerTask,2000); /********** End **********/ } </script></body></html>第2关: 循环定时器<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p onclick="task1()">this is task onea</p> <p onclick="task2()">this is task two</p> <p onclick="removeTask1()">try to remove task one</p> <script> var timeId1; var timeId2; function timerTask1() { console.log("timerTask1!"); } function timerTask2() { console.log("timerTask2!"); } function task1() { timeId1 = window.setInterval(timerTask1,2000); } function task2() { timeId2 = window.setInterval(timerTask2,1500); } function removeTask1() {//请在此处编写代码/********** Begin **********/ window.clearInterval(timeId1);/********** End **********/ } </script></body></html>第3关: location对象<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p onclick="openNew()">Click me to new page!</p> <script> function openNew() { //请在此处编写代码/********** Begin **********/ var loc = window.location; console.log(loc.hostname); loc.href = "https://www.educoder.net/forums/categories/all?order=newest"; /********** End **********/ } </script></body></html>第4关: 对话框<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p onclick="inputName()">Click to input name!</p> <script> function inputName() { var result; //请在此处编写代码/********** Begin **********/ result = window.prompt("your name", "XiaoMing"); if (result === null) { console.log("name cannot be null"); } /********** End **********/ } </script></body></html>第5关: 窗口<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p onclick="openNewWindow()">open new window</p> <script> var myWindow; function openNewWindow() { //请在此处编写代码/********** Begin **********/ myWindow = window.open("Demo.html", "window_name"); /********** End **********/ } </script></body></html>
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目录
JSON
第1关: JSON对象
第2关: JSON数组
第3关: JSON字符串
Math、日期和异常处理
第1关: Math类
第2关: Date类
第3关: JavaScript错误
HTML DOM——文档元素的操作（一）
第1关: 通过id获取文档元素
第2关: 通过类名获取文档元素
第3关: 通过标签名获取文档元素
第4关: html5中获取元素的方法一
第5关: html5中获取元素的方法二
第6关: 节点树上的操作
第7关: 属性值的获取
第8关: 属性值的设置
HTML DOM——文档元素的操作（二）
第1关: 创建节点
第2关: 插入节点
第3关: 删除节点
第4关: 替换节点
第5关: 综合练习
事件处理
第1关: 注册事件处理程序
第2关: 文档加载事件
第3关: 鼠标事件
第4关: 键盘事件
第5关: 表单事件
第6关: 拖动事件
第7关: 事件冒泡
浏览器对象模型
第1关: 定时器
第2关: 循环定时器
第3关: location对象
第4关: 对话框
第5关: 窗口
JSON第1关: JSON对象function mainJs(a,b,c) { //请在此处编写代码/********** Begin **********/ var JSONObject = {"key1":a,"key2":b,"key3":c};//定义JSON对象 delete JSONObject.key3;//删除名字为key3的属性var result = "";for(var att in JSONObject) {//遍历剩余所有的属性result = result+JSONObject[att]+",";}return result.slice(0,-1); /********** End **********/}第2关: JSON数组var myJson = {"category":"computer","detail":"programming","language":["js","java","php","python","c"]}function mainJs(a) {a = parseInt(a); //请在此处编写代码/********** Begin **********/ var result = ""; for(var i = 0;i < a;i++) { result = result+myJson.language[i]+","; } return result.slice(0,-1); /********** End **********/}第3关: JSON字符串var JSONString = '{"key1":"value1","key2":"value2"}';function mainJs(a) { //请在此处编写代码/********** Begin **********///JSON字符串转换为JSON对象 var JSONObject = JSON.parse(JSONString);//修改key1属性的值为参数aJSONObject.key1 = a;//JSON对象转换为JSON字符串并返回 return JSON.stringify(JSONObject); /********** End **********/}Math、日期和异常处理第1关: Math类function mainJs(a) { a = parseInt(a); //请在此处编写代码/********** Begin **********/ var b = Math.ceil(a); var c = Math.floor(a); var d = Math.sqrt(a); var e = Math.round(a); var f = Math.sin(a); return Math.max(b,c,d,e,f)+Math.min(b,c,d,e,f); /********** End **********/}第2关: Date类function mainJs(a) { a = parseInt(a); var date = new Date(a); //请在此处编写代码/********** Begin **********/ var year = date.getFullYear(); var month = date.getMonth(); var cal = date.getDate(); var day = date.getDay(); return year+","+month+","+cal+","+day; /********** End **********/}第3关: JavaScript错误function mainJs(a) { //请在此处编写代码/********** Begin **********/ try { if(a < 0) throw new Error("negative cannot be rooted"); if(a == 0) throw new Error("zero cannot be numerator"); return 1/(Math.sqrt(a)); }catch(err) { return err.message; } /********** End **********/}HTML DOM——文档元素的操作（一）第1关: 通过id获取文档元素<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>get element by id</title></head><body> <a id="a1" src="https://www.google.com">Google</a> <p id="p1">this is a text</p> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var myElement = document.getElementById("a1"); <!---------End---------> myElement.href="https://www.educoder.net"; </script></body></html>第2关: 通过类名获取文档元素<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>get element by name</title></head><body> <img src="" class="myName"/> <form class="myName" id="myForm"></form> <q class="myName">This is quote</q> <p class="myName">This is what you should get</p> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var myElement = document.getElementsByClassName("myName")[3]; <!---------End---------> myElement.innerText="I changed the text"; </script></body></html>第3关: 通过标签名获取文档元素<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>get element by id</title></head><body> <div class="diva"> <a href="https://www.educoder.net">EduCoder</a> <a href="https://www.facebook.com">FaceBook</a> </div> <div class="divb"> <a href="https://www.twitter.com">Twitter</a> <form name="myForm"></form> <a href="https://www.nudt.edu.cn">NUDT</a> </div> <p id="pp">this is a text</p><script><!-- 请在此处编写代码 --> <!---------Begin---------> var temp= document.getElementsByTagName("div")[1]; var myElement = temp.getElementsByTagName("a")[1]; <!---------End---------> myElement.innerText="nudt";</script></body></html>第4关: html5中获取元素的方法一<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <p>你需要获得的元素是我</p> <p>是楼上</p> <p>是楼上的楼上</p> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var pElement = document.querySelector("p"); <!---------End---------> console.log(pElement); </script></body></html>第5关: html5中获取元素的方法二<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <p>你需要获得的元素是我</p> <p>包括我</p> <p>还有我</p> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var pElement = document.querySelectorAll("p"); <!---------End---------> console.log(pElement); </script></body></html>第6关: 节点树上的操作<html><head><title>myTitle</title><meta charset="UTF-8"></head><body><div id="div1"><div class="cl1"><p>文本</p><a>超链接</a></div><div class="cl2"><select><option>红</option><option>黄</option><option>蓝</option></select></div></div> <script> var cl2 = document.getElementById("div1").lastElementChild; <!-- 请在此处编写代码 --> <!---------Begin---------> var myElement = cl2.firstElementChild.children[1]; <!---------End---------> myElement.innerText = "绿"; </script></body></html>第7关: 属性值的获取<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <p id="p"></p> <img class="imgClass"/> <a id="a"></a> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var myElement = document.getElementsByClassName("imgClass")[0]; var srcValue = myElement.className; <!---------End---------> console.log(srcValue); </script></body></html>第8关: 属性值的设置<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <p id="p"></p> <form id="form1" method="get" target="https://abc.xyz/def/ghi">This is form</form> <a id="a"></a> <script><!-- 请在此处编写代码 --> <!---------Begin--------->var myElement = document.getElementById("form1");myElement.method = "post"; <!---------End---------> console.log(document.getElementById("form1").method); </script></body></html>HTML DOM——文档元素的操作（二）第1关: 创建节点<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <p></p> <script> <!-- 请在此处编写代码 --> <!---------Begin---------> var newNode = document.createElement("form"); newNode.method = "post"; newNode.id = "myForm"; <!---------End--------->document.body.appendChild(newNode); console.log(newNode.method); </script></body></html>第2关: 插入节点<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <ul id="ul1"> <li>America</li> <li>Mexio</li> </ul> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var newNode = document.createElement("li"); newNode.innerText = "Canada"; document.getElementById("ul1").appendChild(newNode); <!---------End---------> var out = document.getElementsByTagName("li")[2]; console.log(out.innerText); </script></body></html>第3关: 删除节点<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <ol id="browser"> <li id="chrome">Chrome</li> <li id="firefox">Firefox</li> <li id="opera">Opera</li> <li id="safari">Safari</li> </ol> <script><!-- 请在此处编写代码 --> <!---------Begin---------> var parent = document.getElementById("browser"); var child = document.getElementById("opera"); parent.removeChild(child); <!---------End---------> </script></body></html>第4关: 替换节点<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <ol id="parent"> <a id="old" href="https://www.google.com">Google</a> </ol> <script> var newChild = document.createElement("a"); newChild.innerText = "eduCoder"; newChild.href = "https://www.educoder.net";<!-- 请在此处编写代码 --> <!---------Begin---------> var parent = document.getElementById("parent"); var old = document.getElementById("old"); parent.replaceChild(newChild,old); <!---------End---------> </script></body></html>第5关: 综合练习<html><head><title>myTitle</title><meta charset="utf-8" /></head><body><select id="province" onChange="changeCity()"><option value="BeiJing" id="bj">北京</option> <option value="AnHui" id="ah">安徽</option></select><select id="city"> <option value="BeiJingCity">北京市</option></select><script>function changeCity() { var province = document.getElementById("province"); var city = document.getElementById("city"); var length = city.children.length; for(var i = length-1;i >= 0;i--) { city.removeChild(city.children[i]); } if(province.value == "BeiJing") { var child1 = document.createElement("option"); child1.value="BeiJingCity"; child1.innerText="北京市" city.appendChild(child1); } else { var child1 = document.createElement("option"); child1.value="HuangShanCity"; child1.innerText="黄山市"; city.appendChild(child1);//请在此处编写代码 /*********Begin*********/ var child2 = document.createElement("option"); child2.value="HeFeiCity"; child2.innerText="合肥市"; city.appendChild(child2); /*********End*********/ }}</script></body></html>事件处理第1关: 注册事件处理程序<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <button id="button1" onclick="listenButton1()">按钮1</button> <button id="button2">按钮2</button> <button id="button3">按钮3</button> <script> function listenButton1() { console.log("监听button1"); } function listenButton2() { console.log("监听button2"); } function listenButton3() { console.log("监听button3"); }//请在此处编写代码 /********** Begin **********/ var button2 = document.getElementById("button2"); button2.onclick = listenButton2; var button3 = document.getElementById("button3"); button3.addEventListener("click",listenButton3); /********** End **********/ </script></body></html>第2关: 文档加载事件<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body onload="loadEvent()"> <script> function loadEvent() {//请在此处编写代码/********** Begin **********/console.log("Welcome!");/********** End **********/} </script></body></html>第3关: 鼠标事件<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p id="p"> text </p> <button id="but"> button </button> <script> //请在此处编写代码/********** Begin **********/var myButton = document.getElementById("but"); myButton.addEventListener("click",function() { var myElement = document.getElementById("p"); myElement.innerText="clicked"; }) /********** End **********/ </script></body></html>第4关: 键盘事件<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body onkeypress="pressEvent(event)"> <script> function pressEvent(event) {//请在此处编写代码/********** Begin **********/ var code = event.which; if (code == 13) { console.log("cannot use enter"); }/********** End **********/ } </script> </body></html>第5关: 表单事件<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <form> <input id="input" type="text" onchange="changeEvent()" /> <input id="input2" type="text" /> </form> <script> function changeEvent() { //请在此处编写代码/********** Begin **********/ var ele = document.getElementById("input"); var len = ele.value.length; if (len <= 12) { console.log("too short input"); } /********** End **********/ } </script></body></html>第6关: 拖动事件<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <div><!-- 请在此处编写代码 --> <!---------Begin---------> <p ondrag="dragging(event)" id="p1" draggable="true">drag me</p> <!---------End---------> </div> <script> function dragging(event) { /********** Begin **********/ console.log(event.target.innerText); /********** End **********/ } </script> </body></html>第7关: 事件冒泡<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <div id="div1" onclick="click1()"> <div id="div2" onclick="click2()"> <p id="p" onclick="click3()">click me!</p> </div> </div> <script> function click1() { console.log("root"); } function click2() { //请在此处编写代码/********** Begin **********/ window.event?window.event.cancelBubble=true:event.stopPropagation(); /********** End **********/ console.log("parent"); } function click3() { console.log("child"); } </script></body></html>浏览器对象模型第1关: 定时器<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p onclick="handleTimer()">set timer then undo</p> <script> var timeId; function timerTask() { console.log("this is timer task"); } function handleTimer() { //请在此处编写代码/********** Begin **********/ timeId = window.setTimeout(timerTask,2000); /********** End **********/ } </script></body></html>第2关: 循环定时器<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p onclick="task1()">this is task onea</p> <p onclick="task2()">this is task two</p> <p onclick="removeTask1()">try to remove task one</p> <script> var timeId1; var timeId2; function timerTask1() { console.log("timerTask1!"); } function timerTask2() { console.log("timerTask2!"); } function task1() { timeId1 = window.setInterval(timerTask1,2000); } function task2() { timeId2 = window.setInterval(timerTask2,1500); } function removeTask1() {//请在此处编写代码/********** Begin **********/ window.clearInterval(timeId1);/********** End **********/ } </script></body></html>第3关: location对象<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p onclick="openNew()">Click me to new page!</p> <script> function openNew() { //请在此处编写代码/********** Begin **********/ var loc = window.location; console.log(loc.hostname); loc.href = "https://www.educoder.net/forums/categories/all?order=newest"; /********** End **********/ } </script></body></html>第4关: 对话框<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p onclick="inputName()">Click to input name!</p> <script> function inputName() { var result; //请在此处编写代码/********** Begin **********/ result = window.prompt("your name", "XiaoMing"); if (result === null) { console.log("name cannot be null"); } /********** End **********/ } </script></body></html>第5关: 窗口<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <p onclick="openNewWindow()">open new window</p> <script> var myWindow; function openNewWindow() { //请在此处编写代码/********** Begin **********/ myWindow = window.open("Demo.html", "window_name"); /********** End **********/ } </script></body></html>
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