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(numMath.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-(4i+3))+','+ num.substring(num.length-(4i+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>