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變量是一個容器，定義變量用var標(biāo)志符， 變量的名字（按規(guī)則取，分大小寫）。賦值用= ，變量的值（有數(shù)值，字符串，數(shù)組，對象，null,undefind）變量有類型 類型有（int，string，ar...
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