javascript自动生成包含数字与字符的随机字符串
本文实例讲述了javascript自动生成包含数字与字符的随机字符串的方法。分享给大家供大家参考。具体如下：
这里主要用到Math.random()和Math.floor()两个函数
Math.random() --返回0和1之间的伪随机数可能为0，但总是小于1，[0,1)
Math.floor() --向下取整，舍掉小数字后的值
实现随机多位数的方法：
/**
*
* 随机生成数字
*
*@paramnum生成数字位数
*/
functionrandomNumber(num){
return''+Math.floor(Math.random()*num);
}
javascript随机生成字符
以下实例为随机A-Z/a-z区间中随机出现的字符
/**
*
* 随机生成
*
*@paramdatajson数据例：{"start":0,"end":2,"number":5,"upper":true}
*@paramstart 开始下标
*@paramend 结束下标
*@paramnumber生成位数
*@paramupper 是否大写默认为小写
*/
functionrandomLetter(data){
varletterData="";
varlowercase=newArray("a","b","c","d","e","f","g","h","i","g","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z");
varuppercase=newArray("A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z");
varstart=data.start;
varend=data.end;
varnumber=data.number;
varupper=data.upper;
varlength=end-start;
for(vari=0;i<number;i++){
varindex=Math.floor(Math.random()*length)+start;
varletter="";
if(upper){
letter=uppercase[index];
}else{
letter=lowercase[index];
}
letterData+=letter;
}
returnletterData;
}
引用：
alert(newDate().Format("yyyy-MM-ddhh:mm:ss"));
希望本文所述对大家的javascript程序设计有所帮助。