Object.keys——Object.getOwnPropertyNames——对象.hasOwnProperty
作者:互联网
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class Point { constructor(x, y) { this.x = x; this.y = y; } add(a, b) { return a + b } get age() { return this._age; } // set age(x){ // this._age = x; // } } Object.assign(Point.prototype, { fun1() {} }); Point.prototype.fun2 = function() {} var p = new Point(1,2); console.log(Object.keys(Point.prototype)) //['fun1', 'fun2'] console.log(Object.getOwnPropertyNames(Point.prototype)) //['constructor', 'add', 'age', 'fun1', 'fun2'] console.log(Object.getOwnPropertyNames(p)) //['x', 'y'] console.log(Object.getOwnPropertyNames(new Point(3,4))) //['x', 'y'] console.log(p.hasOwnProperty("x")) //true console.log(p.hasOwnProperty("y")) //true p.age = 100 console.log(p.age) //使用set age(x){}才能取到值
标签:console,log,Point,keys,age,Object,hasOwnProperty,getOwnPropertyNames 来源: https://www.cnblogs.com/sunupo/p/15539267.html