JavaScript生成随机字符详解编程语言

 !DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" 

 html 

 head 

 meta http-equiv="Content-Type" content="text/html; charset=UTF-8" 

 title Random Chars /title 

 style type="text/css" 

body { 

 font-size: 10px; 

 text-align: center; 

td { 

 border: 1px solid #137d5c; 

 text-align: center; 

input { 

 border: 1px solid #137d5c; 

 font-size: 12px; 

 text-align: center; 

 /style 

 script language="JavaScript" 

 function getRandomChars(length) { 

 if (isNaN(length)) { 

 document.getElementById("error").innerText = "闹呢!输入数字!"; 

 return; 

 } else if (parseInt(length) = 0) { 

 document.getElementById("error").innerText = "你会好好的不!!!"; 

 return; 

 } else if (parseInt(length) 16) { 

 document.getElementById("error").innerText = "太长了!最大16!瞎试什么!老实儿的!"; 

 return; 

 } else 

 document.getElementById("error").innerText = ""; 

 var ranChars = ""; 

 var chars = ""; 

 var numChars = "0123456789"; 

 var lowChars = "abcdefghijklmnopqrstuvwxyz"; 

 var upChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 

 var symChars = "`~!@#$%^ *()-_=+[{]}//|;:/", . /?" 

 if (document.ranForm.numChars.checked) 

 chars += numChars; 

 if (document.ranForm.lowChars.checked) 

 chars += lowChars; 

 if (document.ranForm.upChars.checked) 

 chars += upChars; 

 if (document.ranForm.symChars.checked) 

 chars += symChars; 

 if (chars.length 1) { 

 document.getElementById("error").innerText = "闹呢!P都不选生成个P啊!"; 

 return; 

 } else 

 document.getElementById("error").innerText = ""; 

 for ( var i = 0; i length; i++) { 

 ranChars = ranChars + chars.charAt(Math.random() * chars.length); 

 document.getElementById(ranChars).value = ranChars; 

 /script 

 /head 

 body 

 center 

 form name="ranForm" 

 table width="310" 

 td 数字 input name="numChars" type="checkbox" / 小写字母 input 

 name="lowChars" type="checkbox" / 大写字母 input name="upChars" 

 type="checkbox" / 符号 input name="symChars" type="checkbox" / 

 /td 

 /tr 

 td 长度 input id="len" type="text" size="1" maxlength="2" 

 value="数字" / input id="getRan" type="button" value="生成随机字符" 

 input id="ranChars" type="text" readonly="readonly" size="22" / br / 

 div id="error" /div 

 /td 

 /tr 

 /table 

 /form 

 /center 

 /body 

 /html 

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