自定义指令文件

moneyFormat.js

 /**
 * v-money 金额千分位转换
 */

export default {
  inserted: inputFormatter({
    // 格式化函数
    formatter(num, util) {
      if(num == null || num == '' || num == 'undefined' || typeof(num) == 'undefined'){
        return ''
      }
      if(util == '万元' || util == '万'){
        return formatMoney(num,'wan');
      }else if(util == '元'){
        return formatMoney(num);
      }
        // num = num.toString()
        // let num1 = num.split(".")[0], num2 = num.split(".")[1];
        // let c = num1.toString().replace(/(\d)(?=(?:\d{3})+$)/g, '$1,');
        // return num.toString().indexOf(".") !== -1 ? c + "." + num2 : c;
    },
    // 解析函数
    parser(val) {
        val = val.toString().replace(/,/g, "")
        console.log(val,'val')
        return parseFloat(val) //.replace(/0+$/,"");
    },
    isNumber: true
  })
}


/**
 * 监听输入框 数值千位符
 * @param {*} param0 
 * @returns 
 */
function inputFormatter({ formatter = (e) => e, parser = (e) => e, limit = (e) => e, watchInput = true, isNumber = false }){
  return (el, binding, vnode) => {
    console.log(vnode.elm.innerText,'vnode.elm.innerText')
    if(vnode.elm.innerText != '元' && vnode.elm.innerText != '万元' && vnode.elm.innerText != '万'){
      return
    }
      let watchVal = true
      const input = el.getElementsByClassName("el-input__inner")[0] //$(el).find(".el-input__inner")[0]
      // 获取记录光标位置
      let selectionSite
      let getSelectionSite = (event) => {
          let oldVal = event.target.value || ''
          let selectionStart = event.target.selectionStart
          selectionSite = oldVal.length - selectionStart
      }
      // 点击、键盘事件更新光标位置
      el.addEventListener("click", getSelectionSite)
      el.addEventListener("keyup", getSelectionSite)
      //为input绑定值赋值
      const assignment = (val) => {
          vnode.componentInstance.$emit('input', parser(val))
      }
      // 更改显示的值
      const upShow = (val) => {
        console.log(val,'valvalval')
          vnode.context.$nextTick(() => {
              input.value = val
          })
      }
      // 监听绑定值变化
      vnode.componentInstance.$watch('value', val => {
          if (watchVal) { upShow(formatter(val, vnode.elm.innerText)) }
      }, { deep: true, immediate: true })
      // 数字格式化
      let toNumber = (val) => {
          val = val.toString().replace(/[^\d^\.^\-]+/g, "") // 第二步：把不是数字，不是小数点、-的过滤掉
              .replace(/^0+(\d)/, "$1") // 第三步：第一位0开头，0后面为数字，则过滤掉，取后面的数字
              .replace(/^\./, "0.") // 第四步：如果输入的第一位为小数点，则替换成 0. 实现自动补全
              .replace(".", "$#$").replace(/\./g, "").replace("$#$", ".") // 只保留第一个".", 清除多余的"."
          // .match(/^\d*(\.?\d{0,9})/g)[0] || ""; // 第五步：最终匹配得到结果 以数字开头，只有一个小数点，而且小数点后面只能有1到9位小数
          return val
      }
      // 处理最后一位非法字符
      const handlerIllegalStr = (str) => {
          while (!(/^[0-9]+.?[0-9]*/.test(str.charAt(str.length - 1))) && str) {
              str = str.substr(0, str.length - 1)
          }
          return str || ''
      }
      // 监听input事件，可添加操作
      el.addEventListener("input", (event) => {
          let selectionStart = input.selectionStart
          let val = event.target.value
          if (binding.modifiers.number || isNumber) {
              val = toNumber(val)
          }
          let inp = limit(val)
          console.log(inp,'inp')
          event.target.value = inp
          // if (binding.modifiers.watchInput || watchInput) {
          //     assignment(inp)
          //     upShow(formatter(parser(val)))
          // }
          // setTimeout(() => {
          //     if (selectionSite && input.value.length != selectionStart) {
          //         input.selectionStart = input.selectionEnd = input.value.length - selectionSite
          //     }
          // }, 0)
      })
      if (input) {
        // 失去焦点
          input.addEventListener("blur", (event) => {
              watchVal = true
              let val = event.target.value;
              console.log(val,'失去焦点111')
              if(val == null || val == '' || val == 'undefined' || typeof(val) == 'undefined'){
                return ''
              }
              if (binding.modifiers.number || isNumber) {
                  val = handlerIllegalStr(val)
              }
              // assignment(val)
              upShow(formatter(val, vnode.elm.innerText)) 
              console.log(val,'失去焦点22')
          })
          // 获取焦点
          input.addEventListener("focus", (event) => {
              watchVal = false
              let val = event.target.value;
              if(val == null || val == '' || val == 'undefined' || typeof(val) == 'undefined'){
                return ''
              }
              // val = delcommafy(val);
              // assignment(val)
              upShow(parser(val))
              console.log(parser(val),'获取焦点')
          })
      }
  }
} 

//去除千分位中的‘，’
function delcommafy(num){
  if (num) {
    num = num.toString()
    num = num.replace(/,/gi, '')
    num = num.replace(/[ ]/g, '') //去除空格
    return num
  }
  return num 
}


/**
 * 金额千位符转换
 * @param {*}} val //金额
 * @param {*}} util //单位
 * @returns
 */
function formatMoney(val, util) {
  if(!val) return val;
  // 保留小时位数
  var count = util=='wan' ? 6 : 2;
  let str = val.toString().split('.');
  let re = /\d{1,3}(?=(\d{3})+$)/g;
  let n1 = str[0].replace(re, "$&,");
  var zeroCount = str.length > 1 && str[1] ? str[1] : ''
  // 小数点后面金额位置
  var strLength = str.length > 1 && str[1] ? str[1].length : 0
  for (let i = 0; i < (count-strLength); i++) {
    zeroCount += '0'
  }
  return str.length > 1 && str[1] ? `${n1}.${zeroCount}` : `${n1}.${zeroCount}`;
}

暴露指令index文件

directiveIndex.vue

import money from './moneyFormat'

const install = function(Vue) {
  Vue.directive('money', money)
}

export default install

引入自定义指令

main.js

import directive from './directiveIndex'

Vue.use(directive)

使用方式

<el-input v-model="money" placeholder="请输入金额" v-money>
       <template slot="append" >元</template>
</el-input>

预览效果