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js在计算数值时有2个值比较特殊，分别是：NaN 和 Infinity (-Infinity)

Parsing something that isn't a number results in NaN. isNaN helps to detect those cases:

parseInt("hello", 10) // NaN
isNaN(parseInt("hello", 10)) // true

Division through zero results in Infinity:

1 / 0 // Infinity

js用Number方法实现string转int: 代码如下:

var str='1250' ;

alert( Number(str) ); //得到1250

alert(parseInt(str)); //得到1250

var str1='00100';

alert( Number(str1) ); //得到100

alert(parseInt(str1)); //得到64

发现parseInt方法在format'00'开头的数字; 2014/5/14 Comments:转换 Number