// 方法一: ES3
function Person(name, age) {
if (!(this instanceof Person)) {
return new Person(name, age);
}
this.name = name;
this.age = age;
}
// 方法二: ES5
function Person(name, age) {
var self = this instanceof Person ? this : Object.create(Person.prototype);
self.name = name;
self.age = age;
return self;
}
// 方法三:ES6
function Person(name, age) {
if (!new.target) {
throw 'Peron must called with new';
}
this.name = name;
this.age = age;
}
判断对象的实例
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转载自blog.csdn.net/sanlingwu/article/details/79336759
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