查找 数组的对象中某个元素的索引

通过 findIndex 来查找

let  userList = [
	{
		name: 'liu',
		age: 18
	},
	{
		name: 'li',
		age: 15
	},
	{
		name: 'zhao',
		age: 14
	}
];
let name = 'liu';
let index = this.userList.findIndex(item => item.name === name);
console.log(index)   // 打印出来的结果是 ： 0