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415.字符串相加.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <script>
        var addStrings = function (num1, num2) {
            if(num1===""||num1==="0") return num2;
            if(num2===""||num2==="0") return num1;
            let carry = 0;  //进位变量
            let i = 1;
            let targetStr = ""; //和字符串
            while (num1[num1.length - i] || num2[num2.length - i]) { //从后往前遍历，都不存在时结束循环
                let p,q;//p,q代表每次循环相应字符代表的数，如果不存在置为0；
                if(num1[num1.length-i])  p = num1[num1.length-i] -0;
                else  p = 0;
                if(num2[num2.length-i])  q = num2[num2.length-i] -0;
                else q = 0;
                targetStr = ((p + q + carry) % 10)+targetStr;
                carry = parseInt((p + q + carry) / 10);
                i++;
            }
           if(carry) targetStr = carry+targetStr;  //循环结束后，如果进位不为0，在前面拼接上。
           return targetStr;
        };
        addStrings("10000", "26767000");
    </script>
</body>

</html>