How to convert the value bound to v-model in vue into a variable

Convert the string value bound to v-model through the computed attribute: Create a computed attribute and convert the string value into a variable. Use computed attribute in v-model. Example: v-model binds to the convertedValue computed property to convert a string to an integer. Each time the input field is modified, convertedValue calculates and updates the myValue data value.

How to use v-model in Vue to bind strings to variables

In Vue, v The -model directive can be used to create two-way data bindings between form elements and Vue data objects. When v-model is bound to a string, it automatically parses the input value as a string. However, sometimes we need to convert the bound value into a variable.

Method: Using the computed property

The computed property in Vue allows you to dynamically calculate new values ​​from existing data objects. To convert a v-model bound string value, you can use the following steps:

1. Create the computed attribute:

   <code class="javascript">computed: {
     convertedValue: function() {
       // 将 v-model 绑定的字符串值转换为变量
       return parseInt(this.myValue);
     }
   }</code>

2. Use the computed attribute in v-model:

   <code class="html"><input v-model="convertedValue"></code>

Now, every time the input field is modified, the convertedValue computed attribute will be calculated and the entered characters will be Convert the string to an integer and update the value in the Vue data object.

Example:

<code class="javascript">const app = new Vue({
  data() {
    return {
      myValue: '10'
    }
  },
  computed: {
    convertedValue: function() {
      return parseInt(this.myValue);
    }
  }
});</code>

In this code, v-model is bound to the convertedValue computed property, which binds the string value in the myValue data object Convert to integer. When the user modifies the input field, the value of convertedValue is updated, causing the myValue data property to be updated as well.

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