vue 数字金额转大写方法

**实现逻辑**

	亿 仟 佰 拾 万  仟 佰 拾 元 角 分
	1  2  3  4  5  6  7  8  1  2  3
	1  2  3  4  5  0  0  0  1  2  3
	1  2  3  4  5  0  0  0  1  0  3
	1  2  3  4  5  0  0  0  1  1  0
	1  2  3  4  5  0  0  0  0  0  0

	1、格式化入参
	   转为字符串、去掉千分符
	   不足两位小数补零

	2、计算小数、整数长度
		所有的数值对应的汉字，进制对应单位

	3、数字转大写，添加进制

	4、整数部分处理

	5、小数部分处理

<template>
	<div>
		<div>
		<span>
			请输入金额：
		span>
			<el-input placeholder="请输入内容"  class="input-with-select" style="width:300px" v-model="amount">
				<el-button slot="append" icon="el-icon-circle-check" title="金额大写转换" @click="gotoCapAmountFn">el-button>
			el-input>
		div>
		<div>{{capAmount|capAmountToString}}div>
	div>

template>
<script>
export default {
	data() {
		return{
			amount:"",
			capAmount:"",
		}
	},
	filters: {
    capAmountToString: function (values) {
		
		if(values === null || values === ''){
			return "";
		 }
		values = values.toString();
		let reg = new RegExp(",");
		values = values.replace(reg, "");
		// 不足两位小数补零
		let capArr = values.split(".");
		if (capArr.length < 2) {
			capArr[1] = "00";
		} else if (capArr[1].length == 1) {
			capArr[1] = capArr[1][0] + "0";
		}
		

		let len = capArr[0].length; //整数长度
		let len2 = capArr[1].length; //小数长度
		let arr = [],
			arr2 = [];
		let chin_list = ["零","壹","贰","叁","肆","伍","陆","柒","捌","玖",]; //所有的数值对应的汉字
		let chin_lisp = ["仟","佰","拾","兆","仟","佰","拾","亿","仟","佰","拾","万","仟","佰","拾",]; //进制
		let chin_lisp2 = ["角", "分"]; //进制

		// 数字转大写，添加进制
		for (let i = 0; i < len; i++) {
			arr.push(parseInt(capArr[0][i])); //输入的数据按下标存进去   存进去的只是数字
			arr[i] = chin_list[arr[i]]; //是根据我们输入的输入的数字，对应着我们的chin_list这个数组
		} 
		for (let i = len - 1, j = 1; i > 0; i--) {
			//i =2	1		//倒序		为了添加进制，方便我们去观看
			arr.splice(i, 0, chin_lisp[chin_lisp.length - j++]); //j=2
		}
		for (let n = 0; n < len2; n++) {
			arr2.push(parseInt(capArr[1][n])); //输入的数据按下标存进去   存进去的只是数字
			arr2[n] = chin_list[arr2[n]]; //是根据我们输入的输入的数字，对应着我们的chin_list这个数组
		}
		for (let i = len2, j = 1; i > 0; i--) {
			//i =2	1		//倒序		为了添加进制，方便我们去观看
			arr2.splice(i, 0, chin_lisp2[chin_lisp2.length - j++]); //j=2
		}

		arr = arr.join("");
		// 整数位处理
		if (len >= 1) {
			arr += "元";
		}//1234510001=>壹拾贰亿叁仟肆佰伍拾壹万零壹元
		arr = arr
			.replace(/零[仟佰拾]/g, "零");//100051231 =>壹亿零零零伍万壹仟贰佰叁拾壹
		arr = arr.replace(/零{2,}/g, "零");//壹亿零零零伍万壹仟贰佰叁拾壹  =>壹亿零伍万壹仟贰佰叁拾壹
		arr = arr.replace(/零([兆|亿|万|元])/g, "$1")//12300000壹仟贰佰叁拾零万零元 =>壹仟贰佰叁拾万元 
		arr = arr.replace(/亿零{0,3}万/, "亿")//10000000123 =>壹佰亿万零壹佰贰拾叁元   
		arr = arr.replace(/兆零{0,3}亿/, "兆")//10000000000123 壹拾零兆亿零壹佰贰拾叁元 =>
		arr = arr.replace(/^元/, "零元"); //0 ->零元
		
		// 小数位处理
		arr2 = arr2.join("");
		arr = arr + arr2;
		arr = arr.replace(/零角/, "零"); //11.01 壹拾壹元零角壹分 =>壹拾壹元零壹分
		arr = arr.replace(/零{1,2}分/, "整"); //
		
		return arr;
		},
	},
	methods: {
		gotoCapAmountFn(){
			this.capAmount = this.amount;
		}	
	}
}

script>