如何将下列数组中key组成新的数组

Question

var a=[{name:1,key:'a'},{name:2,key:'b'},{name:3,key:'a'},{name:3,key:'b'}]

Answer 1

你好：

var a=[{name:1,key:'a'},{name:2,key:'b'},{name:3,key:'a'},{name:3,key:'b'}];
		var result = new Array();
		for(var index in a){
		 result[a[index].key] = new Array();
		 result[a[index].key].push(a[index]);
		}
		console.log(result);

望采纳！

Answer 2

var b = {};
a.forEach(function (obj) {
    var array = b[obj['key']] || [];
    array.push(obj);
    b[obj['key']] = array;
});
console.log(b.a.length);console.log(b.b.length);