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Solve the problem of being unable to enter the success function after submitting the form in Extjs4_extjs

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Release： 2016-05-16 17:12:17
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1. First make sure that the json format is OK

2. In the returned json, success must be true, because only if it is true, the success function will be entered

because Extjs4 has just ended , I debugged this error for a long time.

Related labels：
Extjs4 form表单提交 success函数
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