JS判断字符串是否为空或是否全为空格

var test = "      ";
//为空或全部为空格
if (test.match(/^[ ]*$/)) {
        console.log("all space or empty");
}

var test = "   
   ";
//var test = "      ";
if(test.match(/^s+$/)){
    console.log("all space or \n")
}
if(test.match(/^[ ]+$/)){
    console.log("all space")
}
if(test.match(/^[ ]*$/)){
    console.log("all space or empty")
}
//空|空格|换行
if(test.match(/^s*$/)){
    console.log("all space or \n or empty")
}