It should be used as follows.
<div class="form-group">
<label class="btn-block" for="form-valicode">验证码</label>
<input type="password" name="form-valicode" placeholder="" class="form-password form-control width-short" id="form-valicode" />
<canvas class="vali-canvas" id="myCanvas" data-ng-init="createCode()" ng-click="createCode()" data-toggle="tooltip" data-placement="top" title="点击更换验证码">
当前浏览器不支持canvas标签！
</canvas>
</div>
<script src="scripts/valicode.js"></script>Note that the id of the tag must be "form-valicode".
To make it work, please add such angular codes on the webpage as:
angular.module("loginApp",[])
.controller("loginController",function($scope){
$scope.createCode = createCode;
$scope.validate = validate;
});