相关疑难解决方法(0)

我理解AngularJS会运行一些代码两次,有时甚至更多,比如$watch事件,不断检查模型状态等.

不过我的代码:

function MyController($scope, User, local) {

var $scope.User = local.get(); // Get locally save user data

User.get({ id: $scope.User._id.$oid }, function(user) {
  $scope.User = new User(user);
  local.save($scope.User);
});

//...

执行两次,将2条记录插入我的数据库.我显然还在学习,因为我多年来一直在抨击这个!

给出以下使用angular.js的代码

Plunkr:http://plnkr.co/edit/i4MAzs

HTML:

<form name="myForm" ng-controller="Ctrl">
  Try clicking on the labels. <br/>
  <label>
    Value1: <input type="checkbox" ng-checked='value1' ng-click='toggleValue1()'>
  </label> <br/>
  <label ng-click='toggleValue2()'>
    Value2: <input type="checkbox" ng-checked="value2">
  </label> <br/>
  <tt>value1 = {{value1}}</tt><br/>
  <tt>value2 = {{value2}}</tt><br/>
  <tt>fire_count = {{fire_count}}</tt>
</form>

使用Javascript:

angular.module('App', []);

function Ctrl($scope) {
  $scope.value1 = true;
  $scope.value2 = 'YES'
  $scope.fire_count = 0;

  $scope.toggleValue1 = function(){
    $scope.value1 = !$scope.value1;
    $scope.fire_count++;
    console.log("Clicked!");
  }

  $scope.toggleValue2 = function(){
    $scope.value2 = !$scope.value2;
    $scope.fire_count++;
    console.log("Clicked!");
  }
}

单击"Value2"标签时,单击事件将触发两次.仅当ng-click附加到标签时才会发生这种情况.当它附加到输入元素时,一切都按预期工作.

有人可以解释发生了什么吗？