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Vue3.2中使用 V-once 和 V-memo 指令如何来提升性能
从 Vue 3.2 版本开始,可以在
以上 p 标签将始终可见。
常规例如:
这个文本永远不会改变:{{ message }}
v-memo 指令
v-memo 指令允许在计算属性或组件方法中缓存计算结果的副本,避免不必要的计算。只有在指定的属性值更改时才会重新计算方法或计算属性的值,并更新界面。
v-memo 是 Vue 3.2 新增的一个指令。它接受一个依赖数组,并且只有在数组中的一个值发生变化时才会重新渲染。
例如:
{{ msg }}
切换
如果传入一个空的依赖项数组,它将与使用 v-once 相同,它永远不会重新渲染。
{{ msg }}
{{ msg }}
切换
注意:v-memo 在 v-for 循环中不起作用,所以如果我们想用 v-for 记忆一些东西,我们必须把它们放在同一个元素上。
常规例如:
{{ message }}
- {{ item }}
注意:
v-once 和 v-memo 指令只能在
基本
文件
流程
错误
SQL
调试
- 请求信息 : 2026-02-17 00:23:54 HTTP/1.1 GET : /article/coddsod.html
- 运行时间 : 0.0615s ( Load:0.0033s Init:0.0005s Exec:0.0533s Template:0.0044s )
- 吞吐率 : 16.26req/s
- 内存开销 : 2,215.73 kb
- 查询信息 : 12 queries 5 writes
- 文件加载 : 36
- 缓存信息 : 0 gets 2 writes
- 配置加载 : 130
- 会话信息 : SESSION_ID=fnqu85ueusi5o996br6l55lnr3
- /home/wwwroot/jxjierui.cn/index.php ( 1.12 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/ThinkPHP.php ( 4.61 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Think.class.php ( 12.26 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Storage.class.php ( 1.37 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.52 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Mode/common.php ( 2.82 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Common/functions.php ( 53.56 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Hook.class.php ( 4.01 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/App.class.php ( 13.49 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Dispatcher.class.php ( 14.79 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Route.class.php ( 13.36 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Controller.class.php ( 11.23 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/View.class.php ( 7.59 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.68 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ParseTemplateBehavior.class.php ( 3.88 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ContentReplaceBehavior.class.php ( 1.91 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Conf/convention.php ( 11.15 KB )
- /home/wwwroot/jxjierui.cn/App/Common/Conf/config.php ( 2.12 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Lang/zh-cn.php ( 2.55 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Conf/debug.php ( 1.48 KB )
- /home/wwwroot/jxjierui.cn/App/Home/Conf/config.php ( 0.32 KB )
- /home/wwwroot/jxjierui.cn/App/Home/Common/function.php ( 3.33 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ReadHtmlCacheBehavior.class.php ( 5.62 KB )
- /home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php ( 6.11 KB )
- /home/wwwroot/jxjierui.cn/App/Home/Controller/CommController.class.php ( 1.60 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Model.class.php ( 60.11 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php ( 32.43 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db/Driver/Pdo.class.php ( 16.74 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache.class.php ( 3.83 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php ( 5.87 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template.class.php ( 28.16 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template/TagLib/Cx.class.php ( 22.40 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template/TagLib.class.php ( 9.16 KB )
- /home/wwwroot/jxjierui.cn/App/Runtime/Cache/Home/7540f392f42b28b481b30614275e4e55.php ( 13.96 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 0.97 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )
- [ app_init ] --START--
- Run Behavior\BuildLiteBehavior [ RunTime:0.000005s ]
- [ app_init ] --END-- [ RunTime:0.000024s ]
- [ app_begin ] --START--
- Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000144s ]
- [ app_begin ] --END-- [ RunTime:0.000157s ]
- [ view_parse ] --START--
- [ template_filter ] --START--
- Run Behavior\ContentReplaceBehavior [ RunTime:0.000065s ]
- [ template_filter ] --END-- [ RunTime:0.000084s ]
- Run Behavior\ParseTemplateBehavior [ RunTime:0.003489s ]
- [ view_parse ] --END-- [ RunTime:0.003504s ]
- [ view_filter ] --START--
- Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000060s ]
- [ view_filter ] --END-- [ RunTime:0.000068s ]
- [ app_end ] --START--
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= )
- [8] Undefined index: pid /home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php 第 47 行.
- [2] file_put_contents(./App/Runtime/Temp/29692172e34d9fc68c21328da7d0ca9d.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.
- [8] Undefined index: db_host /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 120 行.
- [8] Undefined index: db_port /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 121 行.
- [8] Undefined index: db_name /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 122 行.
- [2] file_put_contents(./App/Runtime/Temp/8f3551f11de17dfb7dc777cafb793be7.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.
0.0615s


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