js 代码 摘录收集贴

不定期、偶尔、添加更新 在网络上看到的个人认为经典的代码

1. 

//判断浏览器是否IE
if(!-[1,]) 
        alert("IE");
    else
        alert("非IE");

 

2.  [2012.1.6]

//数组 原型 函数被称为“第一型”经典例子  摘录自 http://www.51cto.com/art/200806/77576.htm
Array.prototype.each = function (closure) {
    return this.length ? [closure(this.slice(0, 1))].concat(this.slice(1).each(closure)) : [];
    //递归？
}

alert(([1, 2, 3, 4].each(function (x) { return x * 2 })).toString());

3.  [2012.1.6]

//闭包  来源 http://book.51cto.com/art/200806/77577.htm
var r=(function outerFun(x){return function innerFun(y){return x * y}})(2)(3);
alert(r);

4.  [判断是否为日期]-搜索来源:http://it.china-b.com/itwy/733458.html

String.prototype.isDate = function() {
    var r = this.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);
    if (r == null)
        return false;
    var d = new Date(r[1], r[3] - 1, r[4]);
    return (d.getFullYear() == r[1] && (d.getMonth() + 1) == r[3] && d.getDate() == r[4]);
};

String.prototype.isTime = function() 
{
    var r = this.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/);
    if (r == null)
        return false;
    var d = new Date(r[1], r[3] - 1, r[4], r[5], r[6], r[7]);
    return (d.getFullYear() == r[1] && (d.getMonth() + 1) == r[3] && d.getDate() == r[4] && d.getHours() == r[5] && d.getMinutes() == r[6] && d.getSeconds() == r[7]);
}