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JS重写toString(),打印想要的值
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JS重写toString(),打印想要的值
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<head><meta charset="UTF-8"><title></title><script type="text/javascript">function Person(name , age , gender){this.name = name;this.age = age;this.gender = gender;}//修改Person原型的toStringPerson.prototype.toString = function(){return "Person[name="+this.name+",age="+this.age+",gender="+this.gender+"]";};//創建一個Person實例var per = new Person("孫悟空",18,"男");var per2 = new Person("豬八戒",28,"男");//當我們直接在頁面中打印一個對象時，事件上是輸出的對象的toString()方法的返回值//如果我們希望在輸出對象時不輸出[object Object]，可以為對象添加一個toString()方法//Person[name=孫悟空,age=18,gender=男]/*per.toString = function(){return "Person[name="+this.name+",age="+this.age+",gender="+this.gender+"]";};*/var result = per.toString();//console.log("result = " + result);//console.log(per.__proto__.__proto__.hasOwnProperty("toString"));console.log(per2.toString());console.log(per.toString());</script>
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<!DOCTYPE html>
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<head><meta charset="UTF-8"><title></title><script type="text/javascript">function Person(name , age , gender){this.name = name;this.age = age;this.gender = gender;}//修改Person原型的toStringPerson.prototype.toString = function(){return "Person[name="+this.name+",age="+this.age+",gender="+this.gender+"]";};//創建一個Person實例var per = new Person("孫悟空",18,"男");var per2 = new Person("豬八戒",28,"男");//當我們直接在頁面中打印一個對象時，事件上是輸出的對象的toString()方法的返回值//如果我們希望在輸出對象時不輸出[object Object]，可以為對象添加一個toString()方法//Person[name=孫悟空,age=18,gender=男]/*per.toString = function(){return "Person[name="+this.name+",age="+this.age+",gender="+this.gender+"]";};*/var result = per.toString();//console.log("result = " + result);//console.log(per.__proto__.__proto__.hasOwnProperty("toString"));console.log(per2.toString());console.log(per.toString());</script>
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