node mkdirSync 创建多级目录

function makeDir(dirpath) {
    if (!fs.existsSync(dirpath)) {
        var pathtmp;
        dirpath.split("/").forEach(function(dirname) {
            if (pathtmp) {
                pathtmp = path.join(pathtmp, dirname);
            }
            else {
　　　　　　　　　 //如果在linux系统中，第一个dirname的值为空，所以赋值为"/"
                if(dirname){
                    pathtmp = dirname;
                }else{
                    pathtmp = "/"; 
                }
            }
            if (!fs.existsSync(pathtmp)) {
                if (!fs.mkdirSync(pathtmp)) {
                    return false;
                }
            }
        });
    }else{
        deleteFolderFiles(dirpath);
    }
    return true;
}