角度复选框“全选”功能不起作用

这里的主要问题是，您将ng模型分配给"checkall"复选框，然后单击ng调用一个函数，在该函数中您再次定义$scope.checkall的值。

您不需要这样做，因为ng模型已经为您设置了该变量的值。

看看这个小提琴，使用你提供的相同代码，但有修复：https://jsfiddle.net/h46rLzhs/5/

 angular.module('MyApp',[])
    .controller('MyController', function($rootScope, $scope){
     $rootScope.selected=[];
     $scope.allCheckBox=[];
     $scope.payout= [
         {'_id':1, value:'Option1'},  
         {'_id':2, value:'Option2'}
     ];
     $scope.toggleAll = function(payout) {
    	// Line below is not needed
        //$scope.checkall = !$scope.checkall;
        for(var i in payout){
           if($scope.checkall===false){
                $rootScope.selected=[];
                $scope.allCheckBox[i] = $scope.checkall ;
           }else{
                $rootScope.selected[i]=payout[i]._id;
                $scope.allCheckBox[i] =$scope.checkall ;
           }
        }
     }
     $scope.selectItem = function(id, list,payout) {
         console.log('id',id);
         var idx = list.indexOf(id);
         if (idx > -1) {
             list.splice(idx, 1);
         } else {
             list.push(id);
         }
         if(payout.length==$rootScope.selected.length){
             $scope.checkall=true;
             console.log($scope.checkall);
             // $scope.checkall=  $scope.checkall;
             console.log('All checkboxes selected');
         }
         else{
             $scope.checkall=false;
             console.log('Not All checkboxes selected');
         }
     }
 })

<div ng-app="MyApp">
  <div ng-controller="MyController">
    
   <div ng-click="toggleAll(payout)">
         select all
     <input type="checkbox" ng-model="checkall"/>
   </div>
   <table>
   <thead>
    <tr>
       <th>Week</th>
       <th>Release Payment</th>
    </tr>
  </thead>
  <tbody>
    <tr ng-repeat="item in payout">
      <td>{{item.value}}</td>
      <td>
        <input type="checkbox" ng-model="allCheckBox[$index]" ng-click="selectItem(item._id,selected,payout)">
      </td>
    </tr>
    </tbody>
   </table>
  </div>
</div>

我修改了您的代码使其工作：

  $scope.checkall=false;
  $scope.allCheckBox=[];
  $rootScope.selected = [];
  $scope.payout = [{
    '_id': 1,
    value: 'Option1'
  }, {
    '_id': 2,
    value: 'Option2'
  }];
  $scope.toggleAll = function() {
    $scope.checkall = !$scope.checkall;
    $rootScope.selected = [];
    $scope.allCheckBox=[];
    for (var i = 0; i < $scope.payout.length; i++) {
      $scope.allCheckBox.push($scope.checkall);
      if ($scope.checkall)
        $rootScope.selected.push($scope.payout[i]);
    }
  }

  $scope.selectItem = function(id) {
    console.log('id', id);
    var idx = $rootScope.selected.indexOf(id);
    if (idx > -1) {
      $rootScope.selected.splice(idx, 1);
    } else {
      $rootScope.selected.push(id);
    }
    if ($scope.payout.length == $rootScope.selected.length) {
      $scope.checkall = true;
      console.log($scope.checkall);
      // $scope.checkall=  $scope.checkall;
      console.log('All checkboxes selected');
    } else {
      $scope.checkall = false;
      console.log('Not All checkboxes selected');
    }
  }

html:

<div class="check_toggle" ng-click="toggleAll()">                               
     select all
   <input type="checkbox" aria-label="Art"  ng-model="checkall"  ng-click="toggleAll()"/>
 </div>
<table>
<thead>
  <tr>
    <th>Week</th>
    <th>Release Payment</th>
  </tr>
</thead>
<tbody>
  <tr ng-repeat="item in payout">
    <td>{{item.value}}</td>
    <td>
      <div class="checkbox pay_check">
        <input aria-label="Art" type="checkbox" ng-model="allCheckBox[$index]" ng-click="selectItem(item._id)">
      </div>
    </td>
  </tr>
</tbody>
</table>

Plunk：https://plnkr.co/edit/SmabE9?p=preview

我没有读过你的问题，但要切换所有复选框，这段代码就可以了。这是你必须操作它的例子。你可以看看这里。https://plnkr.co/edit/qD7CABUF9GLoFCb8vDuO?p=preview

var app = angular.module("test", []);
     app.controller('testctrl',function($scope){
       $scope.options=[
         {option:"option1",
          selected:false ,
         },
         {option:"option1",
          selected:false ,
         },
         {option:"option1",
          selected:false ,
         },
         {option:"option1", 
          selected:false ,
         },
         {option:"option1",
          selected:false ,
         },

         ]
       $scope.test=function(event){
         if(event.currentTarget.checked==true)
       { 
         var togglestatus=$scope.isAllSelected;
         angular.forEach($scope.options,function(object){
           object.selected=togglestatus
         })

<body ng-app="test" ng-controller="testctrl">
   <label>
   <input type="checkbox" ng-model="isAllSelected" ng-click="test($event)">SelectAll</label>
   <div ng-repeat="option in options">
     <input type="checkbox" ng-model="option.selected">checkbox</div>
  </body>      

       }else{
          angular.forEach($scope.options,function(object){
           object.selected=false
         })
       }
       }
     })