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7.JSÖеÄÖµÀàÐÍ:String,Number,Boolean,Null,Object,Function
8.JSÖеÄ×Ö·ûÐÍת»»³ÉÊýÖµÐÍ:parseInt(),parseFloat()
9.JSÖеÄÊý×Öת»»³É×Ö·ûÐÍ:(""+±äÁ¿)
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