for cabbage 单例模式:http://blog.csdn.net/jason0539/article/details/23297037/(singleton) /** *
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_oo0oo_
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o8888888o
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88" . "88
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(| -_- |)
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0\ = /0
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___/`---'\___
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.' \\| |// '.
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/ \\||| : |||// \
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/ _||||| -:- |||||- \
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| | \\\ - /// | |
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| \_| ''\---/'' |_/ |
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\ .-\__ '-' ___/-. /
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___'. .' /--.--\ `. .'___
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."" '< `.___\_<|>_/___.' >' "".
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| | : `- \`.;`\ _ /`;.`/ - ` : | |
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\ \ `_. \_ __\ /__ _/ .-` / /
- =====
-.____
.___ _/.-`__.-'===== -
`=---='
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佛祖开光 永无BUG
*/