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x==y returns truex===y returns false
!=is not equal 不等于5!=8 returns true >is greater than 大于5>8 returns false <is less than 小于5<8 returns true>=is greater than or equal to 大于等于5>=8 returns false<=is less than or equal to 小于等于5<=8 returns trueLogical Operators逻辑运算符OperatorDescriptionExample&&and 与x=6y=3(x < && y > 1) returns true
||or 或x=6y=3(x==5 || y==5) returns false
!not 非x=6y=3!(x==y) returns true
String Operator串符(连接作用)A string is most often text, for example "Hello World!". To stick two or more string variables together, use the + operator.在文字当中使用的比较多,举例来说“Hello World!”要将两个或多个字符串变量衔接在一起的话就得使用 + 符号
txt1="What a very"txt2="nice day!"txt3=txt1+txt2The variable txt3 now contains "What a verynice day!".txt3变量现在包含“What a verynice day!”(把1和2衔接起来了)
To add a space between two string variables, insert a space into the expression, OR in one of the strings.要给两个字符串变量中间添加空格就得在表达式里插入空格,或在其中的一个加上(空格)
txt1="What a very"txt2="nice day!"txt3=txt1+" "+txt2ortxt1="What a very "txt2="nice day!"txt3=txt1+txt2The variable txt3 now contains "What a very nice day!".现在变量txt3为“What a very nice day!”
Conditional Operator条件运算符JavaScript also contains a conditional operator that assigns a value to a variable based on some condition.JS有根据条件不同给变量不同值的条件运算符
Syntax语法variablename=(condition)?value1:value2 Example例子greeting=(visitor=="PRES")?"Dear President ":"Dear "If the variable visitor is equal to PRES, then put the string "Dear President " in the variable named greeting. If the variable visitor is not equal to PRES, then put the string "Dear " into the variable named greeting.如果变量visitor的值等于PRES那么greeting的值就为"Dear President "。如果不为PRES那么greeting的值就为"Dear"
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