在PHP页面执行alert()时,弹出乱码窗口
PHP页面的编码方式是utf-8,用 echo "
原因:因为有alert()输出中文到浏览器,所以一定要在网页中指定编码方式为UTF-8,即该行不能缺少!
注:如果PHP页面编码方式是gb2312,则不需要添加行

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