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标题:javascript实现两个大数(整数)相乘
正文:
在银行系统的开发中，经常遇到很大的数字运算。大数，即超出语言所能表示的数字最大范围的数字，此时的数字只能用字符串来表示。那么如何实现两个大数相乘呢？我用JS实现了一下，代码如下：
代码如下:
console.log(bigMut("567", "1234")); // 699678
function bigMut(big, common) {
big += "";
common += "";
if (big.length < common.length) {
big = [common, common = big][0];
}
big = big.split("").reverse();
var oneMutManyRes = [];
var i = 0,
len = big.length;
for (; i < len; i++) {
oneMutManyRes[oneMutManyRes.length] = oneMutMany(big[i], common) + getLenZero(i);
}
var result = oneMutManyRes[0];
for (i = 1, len = oneMutManyRes.length; i < len; i++) {
result = bigNumAdd(result, oneMutManyRes[i]);
}
return result;
}
function getLenZero(len) {
len += 1;
var ary = [];
ary.length = len;
return ary.join("0");
}
function oneMutMany(one, many) {
one += "";
many += "";
if (one.length != 1) {
one = [many, many = one][0];
}
one = par
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