An article to talk about the commonly used built-in instructions in Vue [Encyclopedia]

This article reviews and summarizes all the built-in instructions ofVue. Some common instructions will be explained first, and the less commonly used instructions will be placed at the back.

0. Interpolation expression

Explanation: Interpolation expression is also calledMustachesyntax (i.e. double braces), the double brace tag will be replaced by the value of themsgattribute in the corresponding component instance. At the same time, it will also be updated synchronously every time themsgattribute changes. [Related recommendations:vuejs video tutorial]

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1. v-on

Instructions:Bind elements Event listener.

Abbreviation:@

Parameters:event(optional when using object syntax)

Modifier:

• .stop- Callevent.stopPropagation().
• .prevent——Callevent.preventDefault().
• .capture- Add event listener in capture mode.
• .self- The handler function is only triggered when the event is emitted from the element itself.
• .{keyAlias}- The processing function is only triggered under certain keys.
• .once——The processing function is triggered at most once.
• .left- Only triggers the handler function on the left mouse button event.
• .right- Only triggers the handler function on the right mouse button event.
• .middle——The handler function is only triggered on the middle mouse button event.
• .passive- Attach a DOM event via{ passive: true }.

Detailed description:The event type is specified by parameters. The expression can be a method name, an inline declaration, or can be omitted if modifiers are present.

• When used for ordinary elements, only listen tonative DOM events. When used in custom element components, listen tocustom eventstriggered by child components.
• When listening to native DOM events, the method receives the native event as the only parameter. If an inline declaration is used, the declaration has access to a special$eventvariable:v-on:click="handle('ok', $event)".
• v-onalso supports binding objects of event/listener pairs without parameters. Note that when using object syntax, no modifiers are supported.

Description:Dynamically bind one or more attributes, which can also be props of components.

Abbreviation::or.(when using the.propmodifier)

Modifier:

• .camel- Convert attributes named with dashes into camel case naming.
• .prop- Force binding to DOM property. 3.2
• .attr- forced binding to DOM attribute. 3.2

Usage:

• When used to bindclassorstyleattribute,v-bindSupports additional value types such as arrays or objects. See the guide link below for details.
• When processing binding, Vue will use theinoperator by default to check whether a DOM property with the same name as the bound key is defined on the element. If a property with the same name exists, Vue will assign it as a DOM property instead of setting it as an attribute. This behavior is consistent with the expected binding value type in most cases, but you can also explicitly force the binding mode using the.propand.attrmodifiers. Sometimes this is necessary, especially when dealing withCustom Elements.
• When used for component props binding, the bound props must be correctly declared in the child component.
• When used without parameters, it can be used to bind an object containing multiple attribute name-binding value pairs.

495f993a7d574e3467199ea0fc65255f 6c49807b5e41afd08b07f879d5b3611f ca2c8067e1037374e5d78c5e839ba8e7 ac4c10b12de52ff39d6dd1a86ea133be65281c5ac262bf6d81768915a4a77ac0 ce4ac11d070d78d3bf4200f56a5282e9 8bc35230c7bba922cce56c732e3b851b 685da3d7c8f7965d80f9edf48daa5f56 32faf3341289b94749af0bf1be652bc865281c5ac262bf6d81768915a4a77ac0 cf92cd4e87509defaf5abc7296f4c6d6 37ccd9321590410723880d35c8a63426 5eabc6319d1f89da1681a3a69d9817aa df1db8db6c6a1bd001a2d325e0dcbba716b28748ea4df4d9c2150843fecfba68 78caffbd9efd2e28142928d3ff73cef716b28748ea4df4d9c2150843fecfba68 e063a6e4f78702bfc30f136daf6fca6016b28748ea4df4d9c2150843fecfba68 c27aa09baa6799cfd4a33ee9cd28ce53 c58a2ee2da6d1a27c74c9b091d80feb516b28748ea4df4d9c2150843fecfba68 d149abd42d3366e14b12501b1112e70216b28748ea4df4d9c2150843fecfba68 8073364419f41ce130335513bf5e1951 d939ca9ed5cd14734c4ddb20e4e79c0f16b28748ea4df4d9c2150843fecfba68 a862b17c74470a288351156b8c4d7f77 9610c342ea57239201ca91be6e4e7501 ea6794c82904aa952ca98ddabb0de838 e69d9b4290fd4fb4a432945fea6a38d6 75b29cbcaccc9c02662e62bd527990c3 486d7a50595533609bc98d44595dc670f56d2e7f23d45ed220101d81457245f15db79b134e9f6b82c0b36e0489ee08edde28f444098d408d960da4dccff3a948

3. v-if

Description:Conditionally render elements based on the truth or falsehood of the expression value Or a template fragment.

4b13269c58155b4d3c3f0e2b713f7a9f哈哈哈哈2e9b454fa8428549ca2e64dfac4625cd

4. v-else

说明：表示v-if或v-if/v-else-if链式调用的“else 块”。

4b13269c58155b4d3c3f0e2b713f7a9fCoder2e9b454fa8428549ca2e64dfac4625cd 6fa679bc7272d905ca47e65714e593c4Bin2e9b454fa8428549ca2e64dfac4625cd

ishow 为 true 显示 Coder，反之显示 Bin

5. v-else-if

说明：表示v-if的“else if 块”。可以进行链式调用。

b2afd68918e546cb374a1c24691a872e 244106ce26f735bc74200a8a7b3280ca 049165843462199f7ad2c1a089cd32aa 90">优秀2e9b454fa8428549ca2e64dfac4625cd 941a9c098be4f0040efec28ed48f877b 60">良好2e9b454fa8428549ca2e64dfac4625cd 6fa679bc7272d905ca47e65714e593c4不及格2e9b454fa8428549ca2e64dfac4625cd 21c97d3a051048b8e55e3c8f199a54b2

v-model 后面会说明

6. v-show

说明：基于表达式值的真假性，来改变元素的可见性。

详细描述：v-show通过设置内联样式的displayCSS 属性来工作，当元素可见时将使用初始display值。当条件改变时，也会触发过渡效果。

b2afd68918e546cb374a1c24691a872e 385ed23b4d02fc77ee7ebd14c8b72ca1哈哈哈哈2e9b454fa8428549ca2e64dfac4625cd 21c97d3a051048b8e55e3c8f199a54b2 3f1c4e4b6b16bbbd69b2ee476dc4f83a const App = { template: '#my-app', data() { return { isShow: true } } } Vue.createApp(App).mount('#app'); 2cacc6d41bbb37262a98f745aa00fbf0

v-show不支持在d477f9ce7bf77f53fbcf36bec1b69b7a元素上使用，也不能和v-else搭配使用。

7. v-model

说明：在表单输入元素或组件上创建双向绑定。

仅限：d5fd7aea971a85678ba271703566ebfd、221f08282418e2996498697df914ce4e、4750256ae76b6b9d804861d8f69e79d3、components

修饰符：

• .lazy——监听change事件而不是input
• .number——将输入的合法符串转为数字
• .trim——移除输入内容两端空格

基本使用：

b2afd68918e546cb374a1c24691a872e 35b2b4783ceb9a54ba9d906c4a31606c 990bd7c4ac2d231cd95d0071b68efb48 --> a19c7450e380302446c011b94704f128 c1a436a314ed609750bd7c7d319db4da{{message}}2e9b454fa8428549ca2e64dfac4625cd 21c97d3a051048b8e55e3c8f199a54b2 3f1c4e4b6b16bbbd69b2ee476dc4f83a const App = { template: '#my-app', data() { return { message: "Hello World" } }, methods: { inputChange(event) { this.message = event.target.value; } } } Vue.createApp(App).mount('#app');

绑定其他表单：

b2afd68918e546cb374a1c24691a872e 4640aafc9f665e8e0861ae4feac02a8f 6f6f0d71120cc4719f1ed49d3bea4e3e 自我介绍 b6bfc2c3df4413e12fb29e24bddd088540587128eee8df8f03d0b607fe983014 8c1ecd4bb896b2264e0711597d40766c c1a436a314ed609750bd7c7d319db4daintro: {{intro}}2e9b454fa8428549ca2e64dfac4625cd ada606ccd251c31e94c3d016eadc7e56 c6a5bebce3c117fdffd863b9251e3393 38fa2ed20090c8ee9c63580128fe7e49 f01f21f30e21ae6d8146c11bad293515 同意协议 8c1ecd4bb896b2264e0711597d40766c c1a436a314ed609750bd7c7d319db4daisAgree: {{isAgree}}2e9b454fa8428549ca2e64dfac4625cd 820b72f7228d77b617dd5fcb1f6b4904 45a2772a6b6107b401db3c9b82c049c2你的爱好: 54bdf357c58b8a65c66d7c19c8e4d114 da039dcce21c416b4ffd9c47728b7146 402e750d8af1b63b81eeec1332c33741 篮球 8c1ecd4bb896b2264e0711597d40766c a7766bdb1fc22a2b0cce202b7fb94330 3c2178265636ba16c83c1a7b917a0a09 足球 8c1ecd4bb896b2264e0711597d40766c fb8859e3c9d4ddf7dfbf06c809df1e45 38966e396fb5e52eadebf3356d27200b 网球 8c1ecd4bb896b2264e0711597d40766c c1a436a314ed609750bd7c7d319db4dahobbies: {{hobbies}}2e9b454fa8428549ca2e64dfac4625cd 2e7579bec9159d1fc6990ceb22eaa5c9 45a2772a6b6107b401db3c9b82c049c2你的爱好: 54bdf357c58b8a65c66d7c19c8e4d114 d2976ba1ac997526f88ca4e8bb4de440 324f1eadb8049e4556029b2df5569ab8男 8c1ecd4bb896b2264e0711597d40766c 38c2d0814907870c5477634d311cab34 06d4777128dbae66d7c8374e8209e12c女 8c1ecd4bb896b2264e0711597d40766c c1a436a314ed609750bd7c7d319db4dagender: {{gender}}2e9b454fa8428549ca2e64dfac4625cd c0feb29bddb0804b1ad0c220ac78d6cb 45a2772a6b6107b401db3c9b82c049c2喜欢的水果: 54bdf357c58b8a65c66d7c19c8e4d114 5fd9cad7608ad243b072348dcee2c27a 54ecce23d4044a0a00d42c566ab225fc苹果4afa15d3069109ac30911f04c56f3338 f1f360e761fd66cc9146e16d2dba497d橘子4afa15d3069109ac30911f04c56f3338 9541c26b2f7167e51c5d3255ce884852香蕉4afa15d3069109ac30911f04c56f3338 18bb6ffaf0152bbe49cd8a3620346341 c1a436a314ed609750bd7c7d319db4dafruit: {{fruit}}2e9b454fa8428549ca2e64dfac4625cd 21c97d3a051048b8e55e3c8f199a54b2 3f1c4e4b6b16bbbd69b2ee476dc4f83a const App = { template: '#my-app', data() { return { intro: "Hello World", isAgree: false, hobbies: ["basketball"], gender: "", fruit: "orange" } }, methods: { commitForm() { axios } } } Vue.createApp(App).mount('#app'); 2cacc6d41bbb37262a98f745aa00fbf0

v-model修饰符的使用

b2afd68918e546cb374a1c24691a872e 7e5b3c60f3664e2ee2a2a24a62fece7f 717719c49b690bb8eece2adabbfc0874 --> 6faceceeebaa105666e801ff935b2463 4888658be233bad65a521f436889bd53 c1a436a314ed609750bd7c7d319db4da{{message}}2e9b454fa8428549ca2e64dfac4625cd 350b7f834ee29bdbd49965c582390625查看类型65281c5ac262bf6d81768915a4a77ac0 --> bd573358cd5fb5aafd63b7aab8099bbb fc0814da98ce60da4c3d680dda8e296c 990bd121baec33b5e8d85431a647259e查看结果65281c5ac262bf6d81768915a4a77ac0 21c97d3a051048b8e55e3c8f199a54b2 3f1c4e4b6b16bbbd69b2ee476dc4f83a const App = { template: '#my-app', data() { return { message: "Hello World" } }, methods: { showType() { console.log(this.message, typeof this.message); }, showResult() { console.log(this.message); } } } Vue.createApp(App).mount('#app'); 2cacc6d41bbb37262a98f745aa00fbf0

8. v-for

说明：基于原始数据多次渲染元素或模板块。

详细描述：

指令值必须使用特殊语法alias in expression为正在迭代的元素提供一个别名：

f4ef030d0839de37c4e1ef433c4b6394 {{ item.text }} 16b28748ea4df4d9c2150843fecfba68

或者，你也可以为索引指定别名 (如果用在对象，则是键值)：

b28e4f7e2b4fedfa35a2eaa3176d8cd316b28748ea4df4d9c2150843fecfba68 598c7327e4dc26847bb4509c91af0aa416b28748ea4df4d9c2150843fecfba68 260bea15910fd895025eea6060c2eab716b28748ea4df4d9c2150843fecfba68

v-for的默认方式是尝试就地更新元素而不移动它们。要强制其重新排序元素，你需要用特殊 attributekey来提供一个排序提示：

eabb038d2c6348808dc15a73bdd3a89d {{ item.text }} 16b28748ea4df4d9c2150843fecfba68

9. v-slot

说明：用于声明具名插槽或是期望接收 props 的作用域插槽。

缩写：#

参数：插槽名 (可选，默认是default)

仅限：

• d477f9ce7bf77f53fbcf36bec1b69b7a
• components(用于带有 prop 的单个默认插槽)

示例

ce4ce005a24c94d9b4e4a39d8a2161ed 71322b3c7af6c94f1e1c4e5773dff577 f7c768329f9d5fe8ef837b28f9460d0e Header content 21c97d3a051048b8e55e3c8f199a54b2 81369fca6737871db11e27c64116e975 Default slot content 21c97d3a051048b8e55e3c8f199a54b2 1e7c531a57ab34112c70be1a88387e8c Footer content 21c97d3a051048b8e55e3c8f199a54b2 a7404faa8989ab176c7e812b70808e66 95dbf192020177187dadd953add4f076 d47f14ce98f36419e01ddc5846584a21 d2d61fc03a199e5255b5f1fb9f3f316d 3756e8adbda7e9b943a61c26f2df1b54 {{ slotProps.item.text }} 16b28748ea4df4d9c2150843fecfba68 21c97d3a051048b8e55e3c8f199a54b2 837cb83ad017825a5f5808eec3f248e2 2e3cf59cf3584e31af52dd69e5425d1d 0990bbde804d14766ed5eb832feb391f Mouse position: {{ x }}, {{ y }} 757fecbcf4645dae34ff02ec40f70f05

10. v-text

说明：更新元素的文本内容。

详细描述：v-text通过设置元素的textContent属性来工作，因此它将覆盖元素中所有现有的内容。如果你需要更新textContent的部分，应该使用mustache interpolations代替。

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11. v-html

说明：更新元素的innerHTML。

详细描述：v-html的内容直接作为普通 HTML 插入—— Vue 模板语法是不会被解析的。如果你发现自己正打算用v-html来编写模板，不如重新想想怎么使用组件来代替。

安全说明: 在你的站点上动态渲染任意的 HTML 是非常危险的，因为它很容易导致XSS 攻击。请只对可信内容使用 HTML 插值，绝不要将用户提供的内容作为插值

820ce39ab3aad7aa68f07baa11715ad416b28748ea4df4d9c2150843fecfba68

12. v-pre

说明：跳过该元素及其所有子元素的编译。

详细描述：元素内具有v-pre，所有 Vue 模板语法都会被保留并按原样渲染。最常见的用例就是显示原始双大括号标签及内容。

2e24149472e5bc58f1ceee49a8c9a583{{ this will not be compiled }}54bdf357c58b8a65c66d7c19c8e4d114

13. v-once

说明：跳过该元素及其所有子元素的编译。

详细描述：在随后的重新渲染，元素/组件及其所有子项将被当作静态内容并跳过渲染。这可以用来优化更新时的性能。

7e8efa3dbcf3fdb345a6412f8702406a 3f25dda40764ecd0ef903ae07954a188This will never change: {{msg}}54bdf357c58b8a65c66d7c19c8e4d114 e2653ecc49c1e70eebe3f42f2ed64d40 8e8069d201fc869e0b021ec4eee7a32c 4a249f0d628e2318394fd9b75b4636b1comment473f0a7621bec819994bb5020d29372a e388a4556c0f65e1904146cc1a846bee{{msg}}94b3e26ee717c64999d7867364b1b4a3 16b28748ea4df4d9c2150843fecfba68 dfe8352334aba3b8aa96d56356ef33cf bd44626675a18da8612637c251a4c1b0 5035b2b6fe29a3799ffa1054970076c4 ff6d136ddc5fdfeffaf53ff6ee95f185 9c24683ccaed9ee5bcef68d7e04aa4f4{{i}}bed06894275b65c1ab86501b08a632eb 929d1f5ca49e04fdcb27f9465b944689

14. v-cloak

说明：用于隐藏尚未完成编译的 DOM 模板。

详细描述：该指令只在没有构建步骤的环境下需要使用。

• 当使用直接在 DOM 中书写的模板时，可能会出现一种叫做“未编译模板闪现”的情况：用户可能先看到的是还没编译完成的双大括号标签，直到挂载的组件将它们替换为实际渲染的内容。
• v-cloak会保留在所绑定的元素上，直到相关组件实例被挂载后才移除。配合像[v-cloak] { display: none }这样的 CSS 规则，它可以在组件编译完毕前隐藏原始模板。

[v-cloak] { display: none; }

611840a88c56f105f2b2c201defa5862 {{ message }} 16b28748ea4df4d9c2150843fecfba68

更多编程相关知识，请访问：编程入门！！

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