js正则表达式的问题？

Question

var str = '\home\index';
var reg = /\\/g;
str.replace(reg, '/');

我想把字符串变成'/home/index',但是为什么没有成功？

Answer 1

Answer 2

var str = '\\home\\index';
"\home\index"
str.replace(/\\/g, '/');
"/home/index"

Answer 3