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中级前端工程师必须要掌握的 28 个 JavaScript 技巧
source link: https://juejin.im/post/5cef46226fb9a07eaf2b7516
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文中代码对应的详细注释和具体使用方法都放在我的 github 上，源代码在底部连接 1.判断数据类型 使用 Object.prototype.toString 配合闭包，在保证判断数据类型的准确性时，同时能让这个函数非常灵活，通过传入不同的判断类型来返回不
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