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 * *@param num 生成数字位数 */ function randomNumber(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 * *@param data json数据 例:{"start":0,"end":2,"number":5,"upper":true} *@param start 开始下标 *@param end 结束下标 *@param number 生成位数 *@param upper 是否大写 默认为小写 */ function randomLetter(data){ var letterData = ""; var lowercase = new Array("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"); var uppercase = new Array("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"); var start = data.start; var end = data.end; var number = data.number; var upper = data.upper; var length = end - start; for(var i= 0;i < number; i++){ var index = Math.floor(Math.random() * length) + start; var letter = ""; if(upper){ letter = uppercase[index]; }else{ letter = lowercase[index]; } letterData += letter; } return letterData; }
引用:
alert(new Date().Format("yyyy-MM-dd hh:mm:ss"));
希望本文所述对大家的javascript程序设计有所帮助。
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