我的备忘录

function str_replace(search, replace, subject) {
    var slen = search.length;
    var rstr = '';
    while (true) {
        var find_idx = subject.indexOf(search);
        if (-1 != find_idx) {
            rstr += subject.substr(0, find_idx) + replace ;
            subject = subject.substr(find_idx + slen);
        } else {
            return rstr + subject;
        }
    }
}