let getArrIndex = function(arr, obj) {
????let index = null;
????let key = Object.keys(obj)[0];
????arr.every(function(value, i) {
????????if (value[key] === obj[key]) {
????????????index = i;
????????????return false;
????????}
????????return true;
????});
????return index;
};
使用方法：let getIndex = getArrIndex(arr,obj);
arr數(shù)組，obj數(shù)組中的對(duì)象