GWT—DynamicForm 在saveData 时Transport error 400 for http url x/xx/...问题解决办法
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由于在用DynamicForm 时，form中的items中的部分隐藏item可能未赋值则为null， 那么提交到后台时不通过，须赋值为空字符串或约定空值即可
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- GWT—DynamicForm 在saveData 时Transport error 400 for http url x/xx/...问题解决办法
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