用javascript判断输入数据是否货币并自动添加￥符号的代码

　　经典上的一位朋友提出的问题，偶以前正好写过一个股票系统处理过一些货币数据，现在记忆犹在，所以就帮忙解决了。自己也保存再次，以便以后使用。

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　　 [Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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