凌树春 开发者_运维技巧2021-02-09 00:58 12-18岁是牙齿矫正的较佳年龄，这个时间段做牙齿矫正一般情况下牙套只需要带1年左右。如果年龄大于20岁，牙齿矫正的时间就会更长。目前牙套种类较多，例如普通牙套、陶
It seems that in Javascript, if you have a reference to some DOM element, and then modify the DOM by adding additional elements to document.body, your DOM reference becomes invalidated.
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