1、构造函数中的方法、自定义函数中、new出的对象里添加方法去使用里边的值对于this指向的对象要清晰
实例
<script>
//在对象中的方法里定义其它对象
function Rect(width,height){
this.width = width;
this.height = height;
this.cal = new Caculator();
this.getArea = function(){
//console.log("面积为："+ this.cal.mul(this.width,this.height))
var that = this;
function print(){//自定义函数的话，则this指针指向的就是window
console.log("面积为："+ that.cal.mul(that.width,that.height))
}
print();
}
this.getCurc = function(){
//console.log(this);
var that = this;
// console.log("上面的内容是getCurc中的this,下面的是this.cal.getC中的this")
this.cal.getC = function(){
//return (this.width + this.height) * 2//这里肯定不行，因为this指针指向的调用他的对象
return (that.width + that.height) * 2
}
console.log("周长为：" + this.cal.getC());
}
}
function Caculator(){
this.mul = function(op1,op2){
return op1 * op2;
}
}
var rect1 = new Rect(8,20);
var rect2 = new Rect(6,7);
rect1.getL = function(){
var that = this;
this.cal.getL = function(){
return that.width>that.height?that.width:that.height
};
console.log("最长的边长为："+this.cal.getL())
}
rect1.getArea();
rect2.getArea();
rect1.getCurc();
rect1.getL();
</script>
