1. 利用 map 数据结构筛选 json 数组。
<!DOCTYPE html>
<html lang="zh">
<head>
<title>利用map数据结构筛选json数组</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<script>
var json = [
{
"id": 1001,
"name": "黄子涵",
"SHA256": "379f7a63ed7a0e21d916f3bd34d466890c42bb15b3d08bcbc7e773ca8ac30e52",
"enterDate": "2022-06-17",
"operator": "admin"
},
{
"id": 1002,
"name": "黄春钦",
"SHA256": "c7fee7aa86bdf86678c6ae0b69c356f1a901259a3dcaee49a69f58e901540b45",
"enterDate": "2022-06-17",
"operator": "admin"
},
{
"id": 1003,
"name": "佘佳梓",
"SHA256": "5e64410f5009d6e895c8a948fb2a38ff35566ff8605b5566885933cd3fe074e2",
"enterDate": "2022-06-17",
"operator": "admin"
},
{
"id": 1004,
"name": "陈兰英",
"SHA256": "7a008f059ca2e78240c3131add56859cd1e792796da117aec7c004f35f53445f",
"enterDate": "2022-06-17",
"operator": "admin"
},
];
var hzhJson = json.map((us) => {
return { hzhname: us.name, hzhSHA256: us.SHA256 }
});
console.log(hzhJson);
</script>
</body>
</html>
2. timeout 方法返回一个 Promise 实例，表示一段时间之后才会发生的结果。过了指定的时间（ms 参数）之后，Promise 实例的状态变为 resolved，就会触发 then 方法绑定的回调函数，在控制台打印“ done ” 。
<!DOCTYPE html>
<html lang="zh">
<head>
<title>Promise</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<script>
function timeout(ms) {
return new Promise((resolve, reject) => {
setTimeout(resolve, ms, '黄子涵');
});
}
timeout(100).then((value) => {
console.log(value);
})
</script>
</body>
</html>
