2018年8月22日

undefined与null的区别
摘要： Is there a universal JavaScript function that checks that a variable has a value and ensures that it's not undefined or null? I've got this code, but 阅读全文
posted @ 2018-08-22 11:29 卖肾割阑尾 阅读(104) 评论(0) 推荐(0)

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