ClausClaus · March 15, 2019 14:21
diff --git a/formatObj.html b/formatObj.html
 <!DOCTYPE html>
 <html>
    <head>
        <title></title>
    </head>

    <body></body>
    <script type="text/javascript">
        /* 无需显式的比较ID是否相等实现数据的对应格式化 */
        var friends = { items: [{ user_id: 1 }] }
        var users = { items: [{ user_id: 1, nickname: 'itchin' }] }
        var identities = { items: [{ user_id: 1, desc: '老师' }] }
        var map_users = {}
        var map_idt = {}
        /* 1.0 先不管ID是否相等，直接循环数据将想要的数据拿出来存在对象当中 */
        /* 2.0 需要将后面要拿来做比较的ID作为对象的键名存在 */
        for (var i = 0; i < users.items.length; ++i) {
            var uid = users.items[i]['user_id']
            map_users[uid] = users.items[i]['nickname']
        }

        for (var i = 0; i < identities.items.length; ++i) {
            var uid = identities.items[i]['user_id']
            map_idt[uid] = identities.items[i]['desc']
        }

        console.log('map_users', map_users)
        console.log('map_idt', map_idt)
        /* 3.0 在最后的循环当中，将ID放到变量中，使用in操作符判断对象是否包含对应这个ID的键名 */
        /* 4.0 包含的话，则使用当前对象[你所需要的键名] = 对象[当前循环对象的ID] 取出属性值 */
        /* 5.0 当前循环到的对象[你所需要的键名] = 对象[当前循环到的对象的ID] 这一步就能实现隐式的ID判断*/
        for (var i = 0; i < friends.items.length; ++i) {
            var uid = friends.items[i]['user_id']
            if (uid in map_users) {
                friends.items[i]['nickname'] = map_users[uid]
            } else {
                friends.items[i]['nickname'] = ''
            }

            if (uid in map_idt) {
                friends.items[i]['desc'] = map_idt[uid]
            } else {
                friends.items[i]['desc'] = ''
            }

            map_users[uid] = identities.items[i]['desc']
        }

        for (var i = 0; i < friends.items.length; ++i) {
            alert(
                friends.items[i]['user_id'] +
                    ' ' +
                    friends.items[i]['nickname'] +
                    ' ' +
                    friends.items[i]['desc']
            )
        }
    </script>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<title></title>
	</head>

	<body></body>
	<script type="text/javascript">
	/* 无需显式的比较ID是否相等实现数据的对应格式化 */
	var friends = { items: [{ user_id: 1 }] }
	var users = { items: [{ user_id: 1, nickname: 'itchin' }] }
	var identities = { items: [{ user_id: 1, desc: '老师' }] }
	var map_users = {}
	var map_idt = {}
	/* 1.0 先不管ID是否相等，直接循环数据将想要的数据拿出来存在对象当中 */
	/* 2.0 需要将后面要拿来做比较的ID作为对象的键名存在 */
	for (var i = 0; i < users.items.length; ++i) {
	var uid = users.items[i]['user_id']
	map_users[uid] = users.items[i]['nickname']
	}

	for (var i = 0; i < identities.items.length; ++i) {
	var uid = identities.items[i]['user_id']
	map_idt[uid] = identities.items[i]['desc']
	}

	console.log('map_users', map_users)
	console.log('map_idt', map_idt)
	/* 3.0 在最后的循环当中，将ID放到变量中，使用in操作符判断对象是否包含对应这个ID的键名 */
	/* 4.0 包含的话，则使用当前对象[你所需要的键名] = 对象[当前循环对象的ID] 取出属性值 */
	/* 5.0 当前循环到的对象[你所需要的键名] = 对象[当前循环到的对象的ID] 这一步就能实现隐式的ID判断*/
	for (var i = 0; i < friends.items.length; ++i) {
	var uid = friends.items[i]['user_id']
	if (uid in map_users) {
	friends.items[i]['nickname'] = map_users[uid]
	} else {
	friends.items[i]['nickname'] = ''
	}

	if (uid in map_idt) {
	friends.items[i]['desc'] = map_idt[uid]
	} else {
	friends.items[i]['desc'] = ''
	}

	map_users[uid] = identities.items[i]['desc']
	}

	for (var i = 0; i < friends.items.length; ++i) {
	alert(
	friends.items[i]['user_id'] +
	' ' +
	friends.items[i]['nickname'] +
	' ' +
	friends.items[i]['desc']
	)
	}
	</script>
	</html>