vue el-input/el-input-number中禁止输入表情符号

问题描述：项目中测试提出问题，在Input输入框中输入表情后，后台会报错，于是想着在前端输入的时候禁止输入表情，或者点击win10输入法后面的表情时，禁止输入表情

分析问题：一开始使用了排除法，让input只能输入数字、字母。但是测试在用不同电脑测试，联想的笔记本电脑用"window+;"还是可以输入，通过复制表情查看，发现是字母。用简单的js去除就解决不了这个问题

解决问题：
在main.js中加入一些代码，自定义一个清除表情的属性。首先npm install emoji-regex

import emojiRegex from 'emoji-regex';  // npm install emoji-regex
Vue.directive('clearEmoij', {
  bind(el, binding, vnode, oldVnode) {
    const regex = emojiRegex();
    const obj = el.querySelectorAll('.el-input__inner,.el-textarea__inner')[0];
    const zclearNoNum = function(e) {
      if (e.target.composing) return;
      const match = regex.exec(obj.value); // 也可以直接用正则表达式判断
      if (match) {
        /* for (let i=0;i<match.length;i++) {
          obj.value = obj.value.replace(match[i],"");
        }*/
        obj.value = obj.value.replace(/(\ud83c[\udc00-\udfff])|(\ud83d[\udc00-\udfff])|(\ud83e[\udc00-\udfff])|[\u2100-\u32ff]|[\u0030-\u007f][\u20d0-\u20ff]|[\u0080-\u00ff]/g, '');
        zclearNoNum(e);
      }
      // 触发v-model的更新
      obj.dispatchEvent(new Event('input'));
    }
    const zblur = function(e) {
      zclearNoNum(e);
      setTimeout(() => {
        const match = regex.exec(obj.value);
        if (match) {
          obj.value = obj.value.replace(/(\ud83c[\udc00-\udfff])|(\ud83d[\udc00-\udfff])|(\ud83e[\udc00-\udfff])|[\u2100-\u32ff]|[\u0030-\u007f][\u20d0-\u20ff]|[\u0080-\u00ff]/g, '');
          zclearNoNum(e);
        }
        // 触发v-model的更新
        obj.dispatchEvent(new Event('change'));
      }, 50)
    }
    obj.onkeyup = zclearNoNum;
    obj.onblur = zblur;
 
 
    function onCompositionStart(e) {
      e.target.composing = true
    }
    function onCompositionEnd(e) {
      console.log('按回车将字输入', e.target.value)
      e.target.composing = false
      obj.dispatchEvent(new Event('change'));
      setTimeout(() => {
        if (obj.value) {
          obj.value = obj.value.replace(/(\ud83c[\udc00-\udfff])|(\ud83d[\udc00-\udfff])|(\ud83e[\udc00-\udfff])|[\u2100-\u32ff]|[\u0030-\u007f][\u20d0-\u20ff]|[\u0080-\u00ff]/g, '');
          zclearNoNum(e);
        }
        // 触发v-model的更新
        obj.dispatchEvent(new Event('change'));
      }, 50)
    }
    obj.addEventListener('compositionstart', onCompositionStart)
    obj.addEventListener('compositionend', onCompositionEnd)
  },
  update(el, binding, vnode, oldVnode) {}
})

然后在input表情中加入自定义指令v-clear-emoij即可

<el-input v-model.trim="temp.name" v-clear-emoij :disabled="!formable" maxlength="30"/>