程序设计中会经常碰到一种情况，就是事先无法得知用户会需要哪些数据，必须根据用户选择后再从服务器重新提取数据后反馈给用户。比如一简单的情况，用户选择省份以后，我们立即会在市里边将这个省的所有市重新显示出来。这种情况一般需要将整个页面刷新后才可以重新读取...

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