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>