验证码
js写一个四位数的随机验证码且颜色随机
<div id="code" onclick="updataCode()"></div> <script> var num = 4; var fontSize = "50px"; function updataCode() { var code = document.getElementById("code"); code.style.borderStyle = "solid"; code.style.borderColor = "#333"; code.style.display = "inline-block"; code.style.cursor = "pointer"; code.style.padding = "10px"; code.innerHTML = getCode(); for (var i = 0; i < num; i++) { var sp = code.getElementsByTagName("span")[i] sp.style.color = getColor(); sp.style.fontSize = fontSize; } } window.onload = updataCode(); // 随机数字 function getCode() { var all = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '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', '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 list = ""; for (var i = 0; i < num; i++) { var word = all[parseInt(Math.random() * all.length)]; list += "<span>" + word + "</span>"; } return list; } // 随机颜色 function getColor() { var color1 = parseInt(Math.random() * 255); var color2 = parseInt(Math.random() * 255); var color3 = parseInt(Math.random() * 255); return "rgb(" + color1 + "," + color2 + "," + color3 + ")"; } </script>
和上面一样的
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style> * { margin: 0; padding: 0; } #auth_code { width: 200px; height: 100px; border: 1px solid #ccc; margin: 200px auto 0; text-align: center; line-height: 100px; font-size: 50px; letter-spacing: 5px; cursor: pointer; } </style> </head> <body> <div id="auth_code" onclick="auth_code()"></div> <script> //验证码内需要字符个数 var num = 4; //点击更换验证码 function auth_code() { //获取id为box元素 var box = $("auth_code"); //随机改变字符 box.innerHTML = randstr(); //获取box里span元素,并换颜色 for (var i = 0; i < num; i++) { var span = box.getElementsByTagName("span")[i]; span.style.color = randcolor16(); } } //获取元素通过ID-----------函数----------- function $(IdName) { return document.getElementById(IdName); } //字符随机选取---------------函数------------ function randstr() { var all = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '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', '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 words = ""; for (var i = 0; i < num; i++) { var word = all[parseInt(Math.random() * all.length)]; words += "<span>" + word + "</span>"; } return words; } //随机颜色rgb------------函数---------------- function randcolor() { var color = parseInt(Math.random() * 255); var color1 = parseInt(Math.random() * 255); var color2 = parseInt(Math.random() * 255); return "rgb(" + color + "," + color1 + "," + color2 + ")" } //随机颜色十六进制-----------函数---- function randcolor16() { var color = "#"; var color16num = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'] for (var i = 1; i <= 6; i++) { color += color16num[parseInt(Math.random() * color16num.length)] } return color; } window.onload = auth_code(); </script> </body> </html>