这样可以吗

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
Object.defineProperty(Object,'freezPolyFill',{
value: function(obj){
let i;
for(i in obj){
if(obj.hasOwnProperty(i)){
if(typeof obj[i] === 'object'){
return Object.freezPolyFill(obj[i]);
}
Object.defineProperty(obj,i,{
writable:false
})
}
}
Object.seal(obj);
}
})

const xiaoming = {
age:14,
name:'xiaoming',
hobby:{
basketball:true,
football:true
}
}

Object.freezPolyFill(xiaoming);
</script>
</body>
</html>

rickleong 2018-08-15

源自：ES6基础入门之let、const 2-9 编程练习

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4回答

好帮手慕夭夭 2018-12-24 10:47:29

@huangmin 你好同学 , 根据练习要求 , 本题能把基本的属性冻结即可 . rickleong同学的效果是实现了的 . 只是同学考虑的更全面一点 . 能够看出来同学学习的很认真细心 . 这一点很值得表扬 . 继续加油 !

祝学习愉快 !

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huangmin 2018-12-22 16:04:02

前面几条回复错了喔数组和对象都能验证通过的是下面这个。

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
Object.defineProperty(Object, 'freezePolyfill', {
value: function(obj) {
var i;
for (i in obj) {
if (obj.hasOwnProperty(i)) {
if (typeof obj[i] === 'object' && !isNaN(obj[i].length)) { //是数组的情况
Object.seal(obj[i]);
Object.defineProperty(obj, i, {
writable: false
});
}else if (typeof obj[i] === 'object'){ //是对象的情况

Object.freezePolyfill(obj[i]);
}else{
Object.defineProperty(obj, i, {
writable: false
});
}
}
}
Object.seal(obj);
}
});

const xiaoming = {
age:14,
name:'xiaoming',
hobby:{
basketball:true,
football:true
},
parents:[1]
}
Object.freezePolyfill(xiaoming);
xiaoming.a="15";
xiaoming.age="age";
xiaoming.hobby["basketball"]="bascket1";
xiaoming.parents=[1,2];
console.log(xiaoming);
</script>
</body>
</html>

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huangmin 2018-12-22 15:48:20

上面代码有bugObject.seal(obj);需要放在for循环里面。修改如下即可。

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
Object.defineProperty(Object,'freezPolyFill',{
value: function(obj){
var i;
for(i in obj){
// console.log(i);
if(obj.hasOwnProperty(i)){
if(typeof obj[i] === 'object'){
return Object.freezPolyFill(obj[i]);
}
console.log(i);
Object.defineProperty(obj,i,{
writable:false
})
}
Object.seal(obj);
}

}
})

const xiaoming = {
age:14,
name:'xiaoming',
hobby:{
basketball:true,
football:true
}
}
Object.freezPolyFill(xiaoming);
xiaoming.a="15";
xiaoming.hobby["basketball"]="bascket1";
console.log(xiaoming);
</script>
</body>
</html>

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好帮手慕夭夭 2018-08-15 15:57:05

效果实现了呢 ,继续加油哦 ,祝学习愉快

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huangmin #1

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <script type="text/javascript"> Object.defineProperty(Object,'freezPolyFill',{ value: function(obj){ var i; for(i in obj){ // console.log(i); if(obj.hasOwnProperty(i)){ if(typeof obj[i] === 'object'){ return Object.freezPolyFill(obj[i]); } console.log(i); Object.defineProperty(obj,i,{ writable:false }) } } Object.seal(obj); } }) const xiaoming = { age:14, name:'xiaoming', hobby:{ basketball:true, football:true } } // console.log(xiaoming); // xiaoming.a="a"; // xiaoming.hobby["basketball"]="bascket"; // console.log(xiaoming); Object.freezPolyFill(xiaoming); xiaoming.a="15"; xiaoming.hobby["basketball"]="bascket1"; console.log(xiaoming); </script> </body> </html>

2018-12-22 15:42:09
huangmin #2

没有实现啊验证下就知道了呢

2018-12-22 15:42:50