JavaScript 函数的call()方法的学习笔记

不说别的,直接上代码

	window.color = "red";
	var o = { color: "blue" };

	function sayColor(){
		alert(this.color);
	}

	sayColor();		//red

	sayColor.call(this);	//red
	sayColor.call(window);	//red
	sayColor.call(o);	//blue

call()用来确定或扩展函数赖以运行的作用域