复制代码 代码如下:

//ECMAScript 5 Function.prototype.bind函数兼容处理

(function(){

if ( !Function.prototype.bind ) { //function(){}.bind

Function.prototype.bind = function ( o, /*参数列表*/ ) {

var self = this, boundArgs = Array.prototype.slice.call(arguments, 0);

return function(){

var args = [], i;

for ( i = 1; i < boundArgs.length; i++ ) args.push(boundArgs[i]);

for ( i = 0; i < arguments.length; i++ ) args.push(arguments[i]);

return this.apply(o, args);

}

}

}

})();

用法示例：

1、简单调用示例

复制代码 代码如下:

/*example 1*/

function f1(y, z){ return this.x + y + z;}

//调用 1

var g1 = f1.bind({x:1}, 2); //this.x = 1; y = 2;

console.loog( g1(3) ); //this.x + y + 3 = 6;

//调用 2

var g2 = f1.bind({x:1}); //this.x = 1;

console.log( g2(2,3) ); //this.x + 2 + 3 = 6

/*example 2*/

var f2(x, y){ return x + y; }

//调用

var g3 = f2.bind(null, 1); //x = 1

console.log( g3(2) ); //x + 2 = 3

2、DOM调用示例

复制代码 代码如下:

var eleBtn = document.getElementById("button")

, eleText = document.getElementById("text");

eleBtn.onclick = function(color) {

color = color || "#003399";

this.style.color = color; //此时的this指向eleText

}.bind(eleText, "#cd0000");