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47 lines
1.2 KiB
47 lines
1.2 KiB
3 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>回顾Object.defineProperty方法</title>
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<script type="text/javascript" src="../vue.js"></script>
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</head>
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<body>
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<div id="root">
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</div>
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<script type="text/javascript">
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Vue.config.productionTip = false
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let number = 18
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let person = {
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name: 'Roger',
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sex: 'male',
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// age: '18'
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}
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Object.defineProperty(person, 'age', {
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// value: '18',
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// enumerable: true, // 控制是否可迭代遍历
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// writable: true, // 控制是否可以修改
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// configurable: true //控制是否可以删除
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// get: function () 用于当调用的时候再获取值，可以简写为 get() {}
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get: function () {
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console.log('获取age')
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return number
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},
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// set function() 用于修改数据是调用 可以简写 set()
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set(value) {
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console.log('新的值为', value)
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number = value
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}
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})
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console.log(Object.keys(person))
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console.log(Object.keys(person).length)
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for (let key in person) {
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console.log(key)
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console.log('@', person[key])
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}
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console.log(person)
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</script>
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</body>
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</html>
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