var id = ['a','b','c','a','d','a','a','b','d','c','a','b','c','a','b','c']
var del = ['a','c'];
var temp01 = [];
var temp02 = []; for(var i in del){
temp01[del[i]] = true;
} for (var k in id){
if(!temp01[id[k]]){
temp02.push(id[k])
}
} console.log(temp02);