js实现多位数加法

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我是靠谱客的博主爱听歌巨人，最近开发中收集的这篇文章主要介绍js实现多位数加法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

标题使用js实现多位数加法

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
    <input id="box1" type="num">+<input id="box2" type="num">=<span id="shu"></span>
    <button id="btn">计算</button>
</body>
<script>
    btn.onclick = function(){
        app()
    }
    function app(){
        let a = box1.value.toString()
        let b = box2.value.toString()
        let c = a.split('').reverse()
        let d = b.split('').reverse()
        let e = []
        function fun(c,d){
            if(c.length == d.length){
                for (let i = 0; i < c .length; i++){
                    e.push(Number(c[i])+Number(d[i]))
                }
            }
            else{
                if(c.length > d.length){
                    let num = c.length - d.length
                    for (let i = 0; i < num; i++){
                        d.push('0')  
                    }
                    fun(c,d)
                }
                else{
                    let num = d.length - c.length
                    for (let i = 0; i < num; i++){
                        c.push('0')  
                    }
                    fun(c,d)
                }
            }
        }
        fun(c,d)
        for (let i = 0; i < e .length; i++){
            if(Number(e[i])>=10){
                if(i < e.length -1){
                    e[i]= Number(e[i])%10
                    e[i+1] = Number(e[i+1])+1
                }
            }
        }
        shu.innerHTML = e.join('')
    }
</script>
</html>