Js基础学习资料_基础知识

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Release: 2016-05-16 18:15:40
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1、防止不支持js的浏览器出问题可以这样处理JS代码

2、JS放置位置:
header:确保脚本被调用时已经加载
body:页面载入时就调用
外部js文件:不包含

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