把含有相同元素的数组 push到一个新的数组

     var arr=[{group:'我',return:false},{group:'我',return:false},{group:'2',return:false},{group:'2',return:false},{group:'4',return:false},{group:'4',return:false}];

        var obj={};
        arr.forEach((item) => {
          if (!obj[item.group]) {
              obj[item.group]=[]
        }
       obj[item.group].push(item)      
      });
      console.log(obj)

屏幕快照 2021-03-22 16.51.53.png