通过window.crypto.getRandomValues获得一个大于零的随机数

window.crypto.getRandomValues(new Uint32Array(1))[0];

浏览器支持情况如下：

IE: no

IE Mobile: no

 

Firefox24+

 

Firefox Mobile: will be in 21

 

Safari: from 3.1

 

Safari Mobile: from iOS 6

 

Chrome: from 11

 

Chrome for Mobile: from 23

Android browser (before 4.0 as replaced with Chrome): no

 

Opera: no (though will probably get it when moving to WebKit)

 

Opera Mobile: no

Opera Mini: no

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