JS判斷字符串是否為空或是否全為空格

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