explain为mysql提供语句的执行计划信息。可以应用在select、delete、insert、update和place语句上。explain的执行计划,只是作为语句执行过程的一个参考,实际执行的过程不一定和计划完全一致,但是执行计划中透露出的讯息却可以帮助选择更好的索引和写出更优化的查询语句。
https://www.oschina.net/question/2005457_2206638 在APP调用浏览器有两种方法: 1.使用openApp 2.使用openWin
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