1  var id = ['a','b','c','a','d','a','a','b','d','c','a','b','c','a','b','c'] 2   var del = ['a','c']; 3   var temp01 = []; 4   var temp02 = []; 5  6   for(var i in del){ 7     temp01[del[i]] = true; 8   } 9 10   for (var k in id){11     if(!temp01[id[k]]){12           temp02.push(id[k])13       }14   }15 16   console.log(temp02);