题解 | #乘法#
乘法
http://www.nowcoder.com/practice/6429776e4630435cbc3eeb36bdf41f83
思路：先换成整数，再乘，再除
function multiply(a, b) {
let s1=a.toString(), s2=b.toString(), m=0;
if(s1.includes('.')){
m+=s1.split('.')[1].length
}
if(s2.includes('.')){
m+=s2.split('.')[1].length
}
return s1.replace('.','')*s2.replace('.','')/Math.pow(10,m)
}
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