IE10以下支持bind()方法

	if (!Function.prototype.bind) { 
		Function.prototype.bind = function (oThis) { 
			if (typeof this !== "function") { 		
				throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable"); 
			} 
			var aArgs = Array.prototype.slice.call(arguments, 1), 
			fToBind = this, 
			fNOP = function () {}, 
			fBound = function () { 
				return fToBind.apply(this instanceof fNOP && oThis ? this : oThis, aArgs.concat(Array.prototype.slice.call(arguments))); 
			}; 
			fNOP.prototype = this.prototype; 
			fBound.prototype = new fNOP(); 
			return fBound; 
		}; 
	}