Setting a Javascript variable to undefined
来源：互联网 发布：linux定时任务crontab 编辑：程序博客网 时间：2024/05/29 14:44
http://stackoverflow.com/questions/5795936/how-to-set-a-javascript-var-as-undefined
delete boo
Don't use var boo = undefined. undefined is just a variable and if someone sets undefined = "hello" then you'll be getting hello everywhere :)
EDIT:
null wasn't same as undefined. removed that bit.
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