vue数字类型过滤器的示例代码

/** * User: sheyude * Date: 2017/9/4 0004 * Time: 上午 10:51 * */let number = {  twoWay: true,    bind:function (el) {  el.addEventListener('blur',function () {    // let value = formatNumber(el.value,2,0)    let value    (function(){      value = formatNumber(el.value,2,0)      return value    })()    el.value =value  })},  update:function (el,binding,vnode) {    if(el.value !== ''){      el.value = el.value.replace(/[^0-9.]+/g, '');    }  }}/** * 将数值四舍五入后格式化. * @param num 数值(Number或者String) * @param cent 要保留的小数位(Number) * @param isThousand 是否需要千分位 0:不需要,1:需要(数值类型); * @return 格式的字符串,如'1,234,567.45' * @type String */function formatNumber(num,cent,isThousand) {  num = num.toString().replace(//$|/,/g,'');  // 检查传入数值为数值类型  if(isNaN(num))    num = "0";  // 获取符号(正/负数)  let sign = (num == (num = Math.abs(num)));  num = Math.floor(num*Math.pow(10,cent)+0.50000000001); // 把指定的小数位先转换成整数.多余的小数位四舍五入  let cents = num%Math.pow(10,cent);       // 求出小数位数值  num = Math.floor(num/Math.pow(10,cent)).toString();  // 求出整数位数值  cents = cents.toString();        // 把小数位转换成字符串,以便求小数位长度  // 补足小数位到指定的位数  while(cents.length<cent)    cents = "0" + cents;  if(isThousand) {    // 对整数部分进行千分位格式化.    for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)      num = num.substring(0,num.length-(4*i+3))+','+ num.substring(num.length-(4*i+3));  }  if (cent > 0)    return (((sign)?'':'-') + num + '.' + cents);  else    return (((sign)?'':'-') + num);}export {  number}

/** * User: sheyude * Date: 2017/9/4 0004 * Time: 上午 11:00 * */import {number} from './numberDirective'import Vue from 'vue'Vue.directive('numbers',number)

<template>  <input type="text" class="form-control" placeholder="" v-numbers v-model="valueData"></template>