JavaScript中字符串数组的长度

Question

In the following JavaScript code snippet, I expect that the console output be 3 but in both Chrome and Mozilla, it is 23. Why?

var status = ["Busy", "Preferred", "Available"];        
console.log( status.length);

Answer 1

There's already a window.status (a global variable named status ). Read more here .

When you're trying to set the array ["Busy", "Preferred", "Available"] to your global variable, the window.status setter will be invoked. So, window.status property will contain the string "Busy,Preferred,Available" .

So, yeah change the variable name or don't use global variables (please).

Answer 2

看起来status是Chrome和Firefox的保留变量，请尝试使用其他变量名。