?????? ??? ??
JavaScript ??? ???? ??? ?????.
String
Number
Boolean
Array
??
Null
???? ??.
JavaScript?? ?? ?? ??? ????.
JavaScript?? ?? ?? ??? ????. ?? ??? ??? ??? ?? ?? ???? ??? ? ??? ?????.
var x; x? ??????
JavaScript ???
???? ??? ???? ?????(?: " ? ???').
???? ??? ?? ?? ???? ? ????. ?????? ????? ??? ? ????.
var carname="Volvo XC60";var carname='Volvo ???? ??? ????.
Example
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>PHP中文網(wǎng)(PHP.CN)</title> </head> <body> <script> var carname1="我是雙引號(hào)"; var carname2='我是單引號(hào)'; var answer1="這是正常的"; var answer2="我的名字是 'Johnny'"; var answer3='我的名字是 "Johnny"'; document.write(carname1 + "<br>") document.write(carname2 + "<br>") document.write(answer1 + "<br>") document.write(answer2 + "<br>") document.write(answer3 + "<br>") </script> </body> </html>
??? ???? ??? ???
JavaScript NumbersJavaScript?? ?? ??? ??? ????. ???? ???? ??? ?? ? ????: var x1=34.00; //???? ???? ?????.
Example<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>PHP中文網(wǎng)（php.cn）</title>
</head>
<body>
<script>
var x1=34.00;
var x2=34;
var y=123e5;
var z=123e-5;
document.write(x1 + "<br>")
document.write(x2 + "<br>")
document.write(y + "<br>")
document.write(z + "<br>")
</script>
</body>
</html>
????? ???? ??? ???
JavaScript Boolean
??( ???)? true ?? false? ? ?? ?? ?? ? ????. var x=true;
var y=false;JavaScript Arrays
?? ??? cars?? ??? ?????.
var cars=new Array();
cars[1]="Volvo";
cars[2]="BMW";?? (??? ??):var cars=new Array("Saab", " Volvo","BMW");
?? (??? ??):
Instance
<!DOCTYPE html>
<html>
<body>
<script>
var i;
var cars = new Array();
cars[0] = "Saab";
cars[1] = "Volvo";
cars[2] = "BMW";
for (i=0;i<cars.length;i++)
{
document.write(cars[i] + "<br>");
}
</script>
</body>
</html>????? ???? ??? ????: ?? ??? 0?? ????? ? ?? The ??? [0]?? ? ?? ??? [1]???. JavaScript ??
??? ???? ?????. ??? ??? ??? ??? ??? ? ?(?? : ?)?? ?????. ??? ??? ?????. var person={firstname:"John", lastname:"Doe", id:5566};
? ?? ??(person)?? ??, ?, ????? ? ?? ??? ????. ID.??? ? ??? ???? ????. ???? ?? ?? ?? ?? ? ????.
var person={
firstname : "John",lastname : "Doe",
id : 5566};
?? ???? ? ?? ?? ?? ??? ????.<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>php中文網(wǎng)(php.cn)</title> </head> <body> <script> var person= { firstname : "John", lastname : "Doe", id : 5566 }; document.write(person.lastname + "<br>"); document.write(person["lastname"] + "<br>"); </script> </body> </html>
????? ???? ??? ???Undefine ? Null
Undefine ? ?? ??? ?? ???? ?? ??? ?????.
?? ?? null? ???? ??? ?? ? ????.
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>php中文網(wǎng)(php.cn)</title> </head> <body> <script> var person; var car="Volvo"; document.write(person + "<br>"); document.write(car + "<br>"); var car=null document.write(car + "<br>"); </script> </body> </html>????? ???? ??? ???
?? ?? ??
? ??? ??? ? "new" ???? ???? ??? ??? ? ????.
var carname=new String;
var x = new Number;
var y= new Boolean;
var cars= new Array;
var person= new Object;Tips: JavaScript ??? ?? ?????. ??? ???? ? ??? ?????.
