需求是：

• 输入框只能输入数字，包括整数和小数

发现网上大部分文章的处理方式：

1. 通过正则来处理输入，对其合法性进行判断校验，再将提示信息反馈给用户。体验欠佳
2. 输入完成后进行解析，将字符串转换为数字。会导致显示的值和真实值不一致

比对一下几种方案后，最终使用的是 el-input type="number" 优化实现

代码 App.vue

<template>
  <div class="">
    
    <h3>el-input</h3>
    <el-input v-model="value1"></el-input>

    <h3>el-input v-model.number</h3>
    <el-input v-model.number="value2"></el-input>
    
    <h3>el-input-number</h3>
    <el-input-number v-model="value3"
      :controls="false"></el-input-number>

    <h3>el-input type="number"</h3>
    <el-input v-model="value4"
      type="number"></el-input>

    <h3>el-input type="number" 优化</h3>
    <el-input v-model="value5"
      type="number"
      class="mo-input--number"></el-input>
  </div>
</template>

<script>
// created at 2022-06-02
export default {
      
  name: 'App',

  props: {
      },

  components: {
      },

  data() {
      
    return {
      
      value1: '',
      value2: '',
      value3: '',
      value4: '',
      value5: '',
    };
  },

  computed: {
      },

  methods: {
      
    async getData() {
      },
  },

  created() {
      
    this.getData();
  },
};
</script>

<style lang="less">
/* 去掉右侧上下箭头  */
.mo-input--number {
      
  input::-webkit-outer-spin-button,
  input::-webkit-inner-spin-button {
      
    -webkit-appearance: none;
  }
  input[type='number'] {
      
    -moz-appearance: textfield;
  }
}
</style>

<style lang="less" scoped>
</style>

依赖 package.json

{
    
  "scripts": {
    
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build"
  },
  "devDependencies": {
    
    "@vue/cli": "^5.0.4",
    "@vue/cli-service": "^5.0.4",
    "css-loader": "^6.7.1",
    "less": "^4.1.2",
    "less-loader": "^11.0.0",
    "style-loader": "^3.3.1",
    "vue-template-compiler": "^2.6.14"
  },
  "dependencies": {
    
    "element-ui": "^2.15.8",
    "vue": "2"
  }
}

入口文件 main.js

import Vue from "vue";
import ElementUI from "element-ui";
import "element-ui/lib/theme-chalk/index.css";
import App from "./App.vue";

Vue.use(ElementUI);

new Vue({
    
  el: "#app",
  render: (h) => h(App),
});

几种方式对比