How to judge if vue numbers are not equal

In the development of Vue.js, numerical comparison judgment is a very common function. Among them, the most common comparison is to determine whether two numbers are equal, but sometimes we also need to determine whether a number is not equal to a certain value. In this article, we will explore how to implement the function of determining whether numbers are not equal in Vue.js.

Vue.js is a popular JavaScript framework for building interactive and dynamic user interfaces. It relies on the concept of data binding to make application development easier. In Vue.js, data binding can be used to achieve high-performance view rendering, and also provides developers with some special syntax and instructions to make it easier to complete development work.

Implementing the judgment of numerical inequality in Vue.js can be achieved by using the "v-if" directive and calculated properties.

Use the v-if directive to determine whether numbers are not equal

In Vue.js, the v-if directive is used to decide whether to show or hide a certain number based on the evaluation result of an expression. element. Therefore, we can use the v-if instruction to determine whether a number is not equal to a certain value.

The specific implementation method is as follows:

<template>
  <div>
    <p v-if="num !== 100">数字不等于100</p>
  </div>
</template>

In the above code, the expression after the "v-if" instruction is "num !== 100", which means when "num" is not equal to 100 When , the text content "The number is not equal to 100" is displayed.

It should be noted here that "!==" is the not equal symbol in JavaScript, which means not only comparing values, but also comparing data types. In Vue.js, you can also use the "!=" symbol for comparison, but it only compares values, not data types.

Use calculated properties to determine whether numbers are not equal

In addition to using the v-if directive, you can also use calculated properties to determine whether numbers are not equal to a certain value. Since computed properties have caching capabilities, in some cases, using computed properties can improve code execution efficiency.

The specific implementation method is as follows:

<template>
  <div>
    <p v-if="notEqual100">数字不等于100</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      num: 50
    }
  },
  computed: {
    notEqual100() {
      return this.num !== 100
    }
  }
}
</script>

In the above code, we define a calculated property named "notEqual100". This property determines whether a number is not equal to 100 based on the value of the "num" variable. When "notEqual100" is true, the text content of "The number is not equal to 100" is displayed.

For this method, we need to process the judgment condition into a calculated attribute variable for easy reference in subsequent code.

Conclusion

This article introduced two ways to implement numerical inequality in Vue.js: using the v-if directive and computed properties. No matter which method you choose, it is easy to determine whether the numbers are equal. At the same time, in actual development, we need to flexibly use the two methods and choose according to the specific situation to obtain the best development effect and performance.

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