Question

跟随我的角对象

  $scope.obj1= [
    {"NewID":38,"Type":"Faculty","Year":"2016","Status":"Active"},
    {"NewID":39,"Type":"Staff","Year":"2016","Status":"Active"},
    {"NewID":40,"Type":"Faculty","Year":"2016","Status":"Active"},
    {"NewID":41,"Type":"Faculty","Year":"2016","Status":"Active"}
 ]

我想检查一下＆＃39; Type＆＃39;包含任何＆＃39;员工＆＃39;或者＆＃39;教师＆＃39;为此，我使用以下代码

      var myobj=$scope.obj1;

       var x=false; y=false;

          for (var i = 0; i < myobj.length; i++) {
            if ( myobj[i].Type == 'Faculty') {                    
                x=true;
                break;
            }

          }
         for (var i = 0; i < myobj.length; i++) {

            if ( myobj[i].Type == 'Staff') {
                y=true;  
               break;               
            }
          }

我使用JavaScript，我正在寻找角度或JavaScript的简单方法，而不是使用for循环

Answer 1

var filteredObjects = $scope.obj1.filter(function(obj){
   return obj.Type === 'Faculty' || obj.Type === 'Staff';
})

这会返回一个包含已过滤对象的数组（类型＆＃39; Faculty＆＃39;＆＃39; Staff＆＃39;）。您可以查看length以查看是否有您需要的任何其他操作。

修改
因为您只想检查它是否包含任何＆＃39; Faculty＆＃39;或者＆＃39;员工＆＃39;你应该使用Array.prototype.some代替。

var exists = $scope.obj1.some(function (obj) { return obj.Type === 'Faculty' || obj.Type === 'Staff'; }

对于单独的结果，您只需创建function
即可
function checkExists (type) { return $scope.obj1.some(function (obj) { return obj.Type === type; } } var facultyExist = checkExists('Faculty'); var staffExist = checkExists('Staff');

Answer 2

filter每次都会创建一个新数组，如果您需要知道对象是否存在，请尝试这个：

obj1= [
    {"NewID":38,"Type":"Faculty","Year":"2016","Status":"Active"},
    {"NewID":39,"Type":"Staff","Year":"2016","Status":"Active"},
    {"NewID":40,"Type":"Faculty","Year":"2016","Status":"Active"},
    {"NewID":41,"Type":"Faculty","Year":"2016","Status":"Active"}
 ];

 const includes = -1 !== obj1.findIndex(item => item.Type === "Faculty" || item.Type === "Staff" );

// in case your browser doesnt support arrow functions:
 const includes2 = 
    -1 !== obj1.findIndex(
    function (item) {
      return  item.Type === "Faculty" || item.Type === "Staff";
      }
    );

Answer 3

  obj1.forEach(function(val,index){
  if(val.type=='Faculty)
  {
   //your code
   } 
  else if(val.type == 'Staff')
  {
     //your code
 })

与角形物体比较

3 个答案: