Javascript为true时，未定义var

Question

我有以下用于测试的代码块：

var readyToGo = false;

readyToGo = true;

console.log(readyToGo); // reads "true" in console

if(readyToGO === false){ // also tried readyToGO == false (that fails too)
  console.log('not ready');
  return false;  
} else {
  alert("true, and we're done!");
}

问题是，控制台显示：

true
ReferenceError: readyToGO is not defined

为什么会出现参考错误？我错过了什么？

Fiddle here

Answer 1

JavaScript区分大小写，readyToGO中有一个大写的O，更改为：

if(readyToGo === false){
//         ^ use lowercase o not O

Updated fiddle

Answer 2

您的变量名为readyToGo，而不是readyToGO。将支票更改为：

if(readyToGo === false){ // also tried readyToGO == false (that fails too)

Answer 3

readyToGO - 拼写错误。应该准备好了吗