几点注意：使用ng的表单验证，需要给form,input,textarea一个name
要求：验证输入框的内容(长度，正则，必填，)，当验证不通过的时候，就禁用提交按钮
使用的验证：ng-maxlength ,ng-minlength ,ng-pattern ,required ,ng-disabled
input的type=“url,email,number,
html:
<form name="idea_info" novalidate>
<!---novalidate阻止浏览器的默认验证--->
<input type="text" name="idea_title" autocomplete="off" required ng-minlength="5" ng-maxlength="20" class="form-control my-panel-title" placeholder="创意标题" ng-model="ideas.name"/>
<div>
<p class="my-help-block" ng-show="idea_info.idea_title.$error.minlength || idea_info.idea_title.$error.maxlength || idea_info.idea_title.$dirty&&idea_info.idea_title.$invalid">标题名5-20个字符</p>
<p class="my-help-block" ng-show="idea_info.idea_title.$error.required || idea_info.idea_title.$dirty&&idea_info.idea_title.$invalid">标题名必填</p>
</div>
<input name=”use_phoner” ng-pattern=”/^1[3,4,5,8,9]\d{9}&/”/>
<!---ng-pattern="/^(13[0-9]|14[0-9]|15[0-9]|17[0-9]|18[0-9])\d{8}$/i"-->
<div>
<p class="my-help-block" ng-show="idea_info.use_phoner.$error.pattern>请输入合法的手机号码格式</p>
</div>
<!--按钮的禁用--->
<p class="bottom-btn text-right">
<button type="submit" class=" my-btn-lg " ng-click="addIdeas()" ng-class="{'active':!idea_info.$invalid}" ng-disabled="idea_info.$invalid" >保存</button>
<button class=" my-btn-lg btn-outline-green" ng-click="cancel_save()">取消</button>
</p>
</form>