js 获取原型的方法？

获取原型的三种方法

function R(){ } var one=new R(); console.log(Object.getPrototypeOf(one)); //官方推荐，规范写法 console.log(one.proto); //不报错，不推荐 console.log(one.constructor.proto) //同上

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a.通过给既定对象的属性赋值

var Calculator = function (para1, para2) { this.para1 = para1; this.para2 = para2; }; Calculator.prototype = { add: function (para1, para2) { return para1 + para2; }, sub: function (para1, para2) { return para1 - para2; } }; var c = new Calculator();

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b.在赋值原型prototype的时候使用function立即执行的表达式来赋值。格 式为xx.prototype = function(){ }();

var Calculator = function (para1, para2) {
    this.para1 = para1;
    this.para2 = para2;
};
 Calculator.prototype = function(){
    add = function (para1, para2) {
        return para1 + para2;
    },
    sub = function (para1, para2) {
        return para1 - para2;
    }
    return {
        add:add,
        sub:sub
    }
}();

var c = new Calculator();

• p.proto
• p.constructor.prototype
• Object.getPrototypeOf(p)