js生成随机字符串,js随机数,js获取随机字符串第一种： //code from http://caibaojian.com/js-random-string.htmlfunction makeid(){ var text = ""; var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; for( var i=0; i < 5; i++ ) text += possible.charAt(Math.floor(Math.random() * possible.length)); return text;}第二种：不需要输入字符集合 function randomstring(L){ var s= ''; var randomchar=function(){ var n= Math.floor(Math.random()*62); if(n<10) return n; //1-10 if(n<36) return String.fromCharCode(n+55); //A-Z return String.fromCharCode(n+61); //a-z } while(s.length< L) s+= randomchar(); return s;}alert(randomstring(5))
第三种：支持自定义字符长度和特征字符集合 function randomString(len, charSet) { charSet = charSet || 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; var randomString = ''; for (var i = 0; i < len; i++) { var randomPoz = Math.floor(Math.random() * charSet.length); randomString += charSet.substring(randomPoz,randomPoz+1); } return randomString;}Call with default charset [a-zA-Z0-9] or send in your own: var randomValue = randomString(5);var randomValue = randomString(5, 'PICKCHARSFROMTHISSET'); 演示截图 
以上就是javascript创建含数字字母的随机字符串的三种方法总结，有需要的可以参考学习。
js生成随机字符串,js随机数,js获取随机字符串
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