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JavaScript中的类型判断，了解一下？
source link: https://juejin.im/post/5b0554c86fb9a07acb3d3ddc
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在前端项目中，谁还没有被对象类型错误坑过？ typeof操作符 通过typeof操作符获取操作数的类型： typeof undefined; // undefined typeof []; // object typeof '123'; // s
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