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假设我有一个输入和验证规则（如最小长度、最大长度等）的表单。我想向用户显示他应该在当前输入值上附加（或删除）多少符号以通过验证规则。但是这个输入对应的 ng-model 是空的，因为输入是无效的。如何访问当前输入值？