<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
//string类型转换为number
function f(){
var var1='10.1';
//将字符串转换为浮点型
var var2=parseFloat(var1);
//var2=10.1
alert(var2);
//输出结果:10.1
}
//将字符串转换为整型
function f2(){
var var1='123a';
var var2=parseInt(var1);
//var2=123
alert(var2);
//输出:123
}
function f3(){
var var1='123e';
//判断变量是否为非数字,如果该变量不是数字,则返回true
if(isNaN(var1)){
alert('非数字');
}else{
alert('是数字');
}
//输出:'非数字'
}
//将数字转换为字符串
function f4(){
var var1=10;
//数字转成字符串
var var2=var1.toString();
alert(var2+100);
//输出一个字符串:'10100'
}
</script>
</head>
<body>
</body>
</html>
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