$scope.arr = [0, 1, 2];  
$scope.dict = {}
for ( var i=0; i < $scope.arr.length; i++ ) {
    if ( $scope.arr[i] == 1 ) {
        $scope.exists = 'yes, 1 exists';
        break;
    }
 }
 if ( $scope.exists ) {
     angular.forEach ( $scope.arr, function ( value, index ) {
                      $scope.dict[index] = value;
     });
 }

break在angular forEach中是不可能实现的，我们需要修改forEach来实现。

$scope.myuser = [{name: "Ravi"}, {name: "Bhushan"}, {name: "Thakur"}];  
                angular.forEach($scope.myuser, function(name){
                  if(name == "Bhushan") {
                    alert(name);
                    return forEach.break(); 
                    //break() is a function that returns an immutable object,e.g. an empty string
                  }
                });

onSelectionChanged(event) {
    let selectdata = event['api']['immutableService']['gridOptionsWrapper']['gridOptions']['rowData'];
    let selected_flag = 0;

    selectdata.forEach(data => {
      if (data.selected == true) {
        selected_flag = 1;
      }
    });

    if (selected_flag == 1) {
      this.showForms = true;
    } else {
      this.showForms = false;
    }
}

我更喜欢用return来做。将循环部分放在私有函数中，并在想要打破循环时返回。

使用Array Some方法

 var exists = [0,1,2].some(function(count){
      return count == 1
 });

Exists将返回true，您可以将其用作函数中的变量

if(exists){
    console.log('this is true!')
}

数组一些方法- Javascript

据我所知，Angular并没有提供这样的函数。你可能想要为此使用下划线的find()函数(它基本上是一个forEach，一旦函数返回true就会跳出循环)。

http://underscorejs.org/#find