35 lines
797 B
Markdown
35 lines
797 B
Markdown
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---
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title: Iterate Over All Properties
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localeTitle: 迭代所有属性
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---
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## 迭代所有属性
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### 方法
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该方法是使用`for-in-loop`迭代对象中的每个属性。然后在循环内部检查属性是`own-property`还是`prototype` ，并将其放在`ownProps[]`数组或`prototypeProps[]`数组中。请记住`push`属性`push`送到`beagle`对象而不是`Dog`对象以传递所有测试用例。
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### 解
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```javascript
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function Dog(name) {
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this.name = name;
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}
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Dog.prototype.numLegs = 4;
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let beagle = new Dog("Snoopy");
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let ownProps = [];
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let prototypeProps = [];
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// Add your code below this line
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for (let property in beagle) {
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if(Dog.hasOwnProperty(property)) {
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ownProps.push(property)
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}
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else {
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prototypeProps.push(property)
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}
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}
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```
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