forked from theluyuan/Web
81 lines
1.0 KiB
Markdown
81 lines
1.0 KiB
Markdown
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### 方法的注释
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方法写完之后(注意,一定要先写完整),我们在方法的前面输入`/**`,然后回车,会发现,注释的格式会自动补齐。
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比如:
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```javascript
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/**
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* 功能:给定元素查找他的第一个元素子节点,并返回
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* @param ele
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* @returns {Element|*|Node}
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*/
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function getFirstNode(ele){
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var node = ele.firstElementChild || ele.firstChild;
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return node;
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}
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```
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### 断点调试
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(1)先让程序运行一遍。
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(2)f12,弹出代码调试工具
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(3)打断点:
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![](http://img.smyhvae.com/20180124_2035.png)
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然后刷新页面。
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(4)一步步调试,每点击一次,执行一步:
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![](http://img.smyhvae.com/20180124_2036.png)
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(5)监视变量:
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当然,也可以添加变量或者表达式到监视窗口。操作如下:
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![](http://img.smyhvae.com/20180124_2037.png)
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上图中,选择变量或表达式,然后右键add to watch.
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然后监视窗口:
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![](http://img.smyhvae.com/20180124_2038.png)
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