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73 lines
2.3 KiB
Plaintext
73 lines
2.3 KiB
Plaintext
var code;
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function createCode() {
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code = "";
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var codeLength = 5; //验证码的长度
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var checkCode = document.getElementById("checkCode");
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var codeChars = new Array(2, 3, 4, 5, 6, 7, 8, 9,
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'); //所有候选组成验证码的字符，当然也可以用中文的
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for (var i = 0; i < codeLength; i++) {
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var charNum = Math.floor(Math.random() * 58);
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code += codeChars[charNum];
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}
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if (checkCode) {
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checkCode.className = "code";
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checkCode.innerHTML = code;
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}
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var canvas = document.getElementById('canvas');
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context = canvas.getContext('2d');
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context.clearRect(0, 0, canvas.width, canvas.height);
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context.font = '16px sans-serif';
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context.fillStyle = '#4B4B4B';
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context.fillText(code, 12, 18);
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context.lineWidth = 3;
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for (var i = 0; i < 4; i++) {
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context.beginPath();
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context.strokeStyle = getRandomColor(120, 220);
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context.moveTo(Mathrandom(0, 30), Mathrandom(0, 40));
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context.lineTo(Mathrandom(90, 110), Mathrandom(0, 40));
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context.stroke();
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}
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for (var i = 0; i < 25; i++) {
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context.beginPath();
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context.fillStyle = getRandomColor(120, 220);
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context.arc(Mathrandom(5, 110), Mathrandom(5, 35), 1, 0, Math.PI * 2);
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context.fill();
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}
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}
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function getRandomColor(min, max) {
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var r = Mathrandom(min, max);
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var g = Mathrandom(min, max);
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var b = Mathrandom(min, max);
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return "rgb(" + r + "," + g + "," + b + ")";
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}
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function Mathrandom(min, max) {
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return parseInt(Math.random() * (max - min + 1) + min);
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}
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function validateCode() {
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var inputCode = $("#inputCode").val();
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if (inputCode.length <= 0) {
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alert('请输入验证码');
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return false;
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}
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else if (inputCode.toUpperCase() != code.toUpperCase()) {
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alert('验证码错误，请重新输入');
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$("#inputCode").val("");
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$("#TB_PW").val("");
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createCode();
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return false;
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}
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else {
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return true;
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}
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}
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