2)、NaN与任何值都不相等,包括NaN本身 3)、在ECMAScript中,任何数值除以0都会返回NaN,因此不会影响其他代码的执行。(这里有一点要指出,任何数值除以0都会返回NaN,这是原书的说法,但实际上只有0除以0才回返回NaN,正数除以0返回Infinity,负数除以0返回-Infinity) 下面看一个例子: alert(NaN == NaN);//false 【...
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