var genSessionId = function(length){
var str = genSessionId.characters;
if ( !"0"[0] ) { //fix IE67
str = str.split("");
}
for(var i=0,id="",len = str.length;i < length;i++){
id += str[Math.floor(Math.random() * len)];
}
return id;
}
genSessionId.characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
alert(genSessionId(24))
转自：https://www.cnblogs.com/rubylouvre/archive/2010/07/19/1780432.html
Original: https://www.cnblogs.com/gopark/p/13743469.html
Author: 极客小乌龟
Title: 生成一个session id
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