Html 角度验证问题和/或_Html_Angularjs_Validation

Html 角度验证问题和/或

html angularjs validation

Html 角度验证问题和/或,html,angularjs,validation,Html,Angularjs,Validation,我的角度验证有问题。我有一个输入，似乎表现得很奇怪。以下是代码片段： <input name="username" class="form-control" type="text" placeholder="Username" ng-model="user.username" ng-minlength="4" ng-maxlength="12" ng-change="checkUsername(user.username);" required/> <span

我的角度验证有问题。我有一个输入，似乎表现得很奇怪。以下是代码片段：

<input name="username" class="form-control" type="text" placeholder="Username" ng-model="user.username" ng-minlength="4" ng-maxlength="12" ng-change="checkUsername(user.username);" required/>
        <span ng-show="doesUserExist || submitted && registerForm.username.$error.required || submitted && registerForm.username.$invalid" class="glyphicon glyphicon-remove form-control-feedback"></span>

{{doesUserExist | | submitted&®isterForm.username.$error.required | | | | submitted&®isterForm.username.$invalid}}在最后一行中有多余的字符{{请使用确保首先触发哪个操作..嗨，伙计们，谢谢你们的帮助。原来问题是服务返回了字符串…所以当我将其更改为doesUserExist=='true'时，angular有点害怕一切似乎都很好

{{doesUserExist}] - false
{{registerForm.username.$error.required}} - true
{{registerForm.username.$invalid}} - true
{{doesUserExist || submitted && registerForm.username.$error.required || submitted && {{registerForm.username.$invalid}} - false