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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>类的扩充</title>
<script type="text/javascript">
//多次调用函数f,歘让你一个迭代数
//比如,要输出“hello”三次;
// var n = 3;
// n.times(function(n){console.log( n + +" hello!");})
Number.prototype.times = function(f,context) {
var n = Number(this);
console.log(context);
//for (var i = 0; i< n; i++) f.call(context,i)
for (var i = 0; i< n; i++) f(i);
}
var n = 3;
n.times(function(n){console.log( n +" hello!");});
//如果不存在ES5的String.trim()方法的话，就定义它
//这个方法用以去除字符串开的和结尾的空格
String.prototype.trim = String.prototype.trim || function()
{
if(!this) return this; //空字符不坐处理
return this.replace(/^\s+|\s+$/g,"");//使用正则表达是进行空格替换
};
var s = " ss ";
console.log( s.trim() );
//返回函数的名字，如果它有(非标准的)name属性，则使用name属性
//否则，将函数转为字符串从总提取名称
//如果没有名字的函数，则返回一个空字符串
Function.prototype.getName = function(){
return this.name || this.toString().match(/function\s*([^()*]\(/)[1];
};
function f(){
return "nick";
}
console.log( "获取函数的名字：" + f.getName());
</script>
</head>
<body>
<input id="name1" name="name1" value="x" maxlength="30" minlength="3">
<input id="name2" name="name2" value="x" maxlength="30" minlength="3">
</body>
</html>
<script>
document.getElementById("name2").onkeydown = function(){
console.log( document.getElementById("name1") );
document.getElementById("name1").focus();
}
</script>