Function.prototype.bind用法示例

//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

/*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

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");