- 同步：执行顺序和任务排列顺序一致
- 异步：跳过，继续执行（依次唤醒，先返回先执行）
```
data() {
return {
arr: ['张三', '李四', '王二', '麻子'],
getName: ''
}
},
onShow() {
this.setName();
},
methods: {
getIndex() {
return new Promise((resolve, reject) => {
setTimeout(function() {
let _index = parseInt(Math.random() * 4);
console.log("_index",_index)
resolve(_index)
}, 1000);
})
},
async setName() {
let n =await this.getIndex();
console.log('n', n)
setTimeout(() => {
this.getName = this.arr[n];
}, 0)
}
}
```
