<!DOCTYPE html>
<html>
<head>
<title>第一个javascript程序</title>
<script type="text/javascript">
/*var a=10;
var b=10.2;
var c=5e2;
var d=1.2e-3;
var e=0xf;
var f=014;
var g=.2e2;
alert(a+"\n"+b+"\n"+c+"\n"+d+"\n"+e+"\n"+f+"\n"+g);
var num1="abc";
var num2="bcd";
alert(num1==num2)
var a;
alert (a);
alert (String.abc);
var b=null;
var a;
alert (b==a);*/
/*var a="3.5";
var b=a-2;
var c=a*2;
var d=a+2;
//alert(b+"\n"+c+"\n"+d);
alert(parseFloat(a)+2);*/
/*
var str="cxk-Love-song-rap and Basketball";
alert(str.length);
alert(str.charAt(7));
alert(str.toUpperCase());
alert(str.indexOf('o'));
alert(str.lastIndexOf('o'));
alert(str.indexOf('o',7));
alert(str.substring(2));
alert(str.substring(2,4));
alert(str.slice(2));
alert(str.slice(2,4));
alert(str.slice(3,-1));
alert(str.slice(3,-10));
alert(str.slice(-3,-1));
alert(str.replace("t","f"));
var arr=str.split('-');
for(i=0;i<arr.length;i++){
alert(arr[i]);
}
alert(str.match("bbb"));
alert(str.search("Love2"));
*/
/*var str="cxk-Love-song-rap and Basketball";
//var reg=/cxk/;
var reg=new RegExp('cxk');
//alert(reg.exec(str));
//alert(reg.test(str));
*/
/*var str="";
var reg=/./;
alert(reg.test(str));
*/
/*var phone="1A11";
var reg=/\D/;
alert(reg.test(phone));
*/
/*
var str="c x k";
var reg=/\S/;
alert(reg.test(str));
*/
/*
var str="fasdfas_123$";
var reg=/\W/;
alert(reg.test(str));
*/
/*
var str="cxk";
var reg=/\bc/;
var reg2=/k\b/;
alert(reg.test(str));
alert(reg2.test(str));
*/
/*
var str="cxk";
var reg=/[^cxk]/;
alert(reg.test(str));
*/
/*
var str="aaas";
var reg=/[A-Z]/;
alert(reg.test(str));
*/
var str="reedcxk";
var reg=/(red|blue|green)/;
alert(reg.test(str));
</script>
</head>
<body>
</body>
</html>
