JS生成随机字符
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<!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;} elsedocument.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;} elsedocument.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"><tr><td>数字<input name="numChars" type="checkbox" />小写字母<inputname="lowChars" type="checkbox" />大写字母<input name="upChars"type="checkbox" />符号<input name="symChars" type="checkbox" /></td></tr><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"onClick="getRandomChars(document.getElementById('len').value)" /><input id="ranChars" type="text" readonly="readonly" size="22" /><br /><div id="error" style="color: red;"></div></td></tr></table></form></center></body></html>
