What are the common instructions in vue?

Vue common instructions include v-if and v-show instructions, v-for instructions, v-bind instructions, v-on instructions, v-model instructions, v-text instructions, v-html instructions, v -cloak instructions, etc. Detailed introduction: 1. v-if and v-show instructions, used to conditionally render DOM elements; 2. v-for instruction, which can be used to traverse arrays or objects and generate corresponding DOM elements based on each element. ;3. v-bind instruction, etc.

The operating environment of this tutorial: Windows 10 system, JavaScript ECMAScript 2023 version, Dell G3 computer.

Vue is a popular front-end framework that simplifies the complexity of front-end development. In Vue, directives are special HTML attributes that can be used to apply specific behaviors on DOM elements. This article will introduce some commonly used Vue instructions and their usage.

1. v-if and v-show instructions: These two instructions are used to conditionally render DOM elements. v-if determines whether to render an element based on the true or false expression, while v-show controls the display and hiding of elements by changing the display attribute of CSS.

2. v-for instruction: This instruction can be used to traverse an array or object and generate corresponding DOM elements based on each element. The syntax is similar to "v-for="(item, index) in items"", where item is the element to be traversed and index is the index of the element in the array.

3. v-bind directive: This directive is used to dynamically bind HTML attributes. You can use the shorthand syntax ":" to replace v-bind, such as ":src="imageUrl"".

4. v-on instruction: This instruction is used to listen to DOM events and execute the corresponding JavaScript code. You can use the shorthand syntax "@" to replace v-on, such as "@click="handleClick"".

5. v-model directive: This directive is used to implement two-way data binding. It can associate the value of the form element with the data attribute of the Vue instance, so that data changes can be automatically reflected in the form element. At the same time, the user's input in the form element will also affect the data change.

6. v-text directive: This directive is used to bind data to the textContent attribute of the element. It can be understood as inserting data into the element in the form of text.

7. v-html directive: This directive is used to bind data to the innerHTML attribute of the element. The data can be parsed as HTML and inserted into the element.

8. v-cloak directive: This directive is used to solve the problem of page flickering when the Vue instance is not fully loaded. It is used together with a corresponding CSS style to allow the element to remain hidden until the Vue instance is loaded.

In addition to the instructions listed above, Vue also provides many other useful instructions, such as v-else, v-pre, v-once, etc. These instructions can help developers more flexibly control the rendering and behavior of DOM elements.

To sum up, Vue's directive is a powerful tool that can help us simplify and manipulate DOM elements more flexibly. Proficiency in these instructions is very important for developing Vue applications.

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