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python mAth.isnAn

你也许需要 float("nan") 和 math.isnan(x) >>> float("nan") nan >>> nan = float("nan") >>> import math >>> math.isnan(nan) True >>> math.isnan(1) False >>> math.isnan(nan + 1) True

t1.text = String(Math.round(Math.random ()*100));t2.text = String(... if( isNaN(Number(e.text))) { e.text =""; } else { t3.appendText...

function fRandomBy(under, over){//输出指定范围内的随机整数 switch(arguments.length){ case 1: return parseInt(Math.random()*under+1); case 2: return parseInt(Math.random()*(over-under+1) + under); default: return 0; } } var x = ...

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