江苏做网站xlec,抖音代运营是什么,网站建设四段合一,优秀网站分析案例在mvc 出现之前 生成验证码思路
在一个html页面上#xff0c;生成一个验证码#xff0c;在把这个页面嵌入到需要验证码的页面中。
JS生成验证码
script typetext/javascriptjQuery(function ($) {/**生成一个随机数**/function randomNum(min, max) {…在mvc 出现之前 生成验证码思路
在一个html页面上生成一个验证码在把这个页面嵌入到需要验证码的页面中。
JS生成验证码
script typetext/javascriptjQuery(function ($) {/**生成一个随机数**/function randomNum(min, max) {return Math.floor(Math.random() * (max - min) min);}/**生成一个随机色**/function randomColor(min, max) {var r randomNum(min, max);var g randomNum(min, max);var b randomNum(min, max);return rgb( r , g , b );}var code drawPic();document.getElementById(changeImg).onclick function (e) {e.preventDefault();code drawPic();}/**绘制验证码图片**/function drawPic() {var canvas document.getElementById(canvas);var width canvas.width;var height canvas.height;//获取该canvas的2D绘图环境 var ctx canvas.getContext(2d);ctx.textBaseline bottom;/**绘制背景色**/ctx.fillStyle randomColor(180, 240);//颜色若太深可能导致看不清ctx.fillRect(0, 0, width, height);/**绘制文字**/var str ABCEFGHJKLMNPQRSTWXY123456789;var code ;//生成四个验证码for (var i 1; i 4; i) {var txt str[randomNum(0, str.length)];code code txt;ctx.fillStyle randomColor(50, 160);//随机生成字体颜色ctx.font randomNum(15, 40) px SimHei;//随机生成字体大小var x 10 i * 25;var y randomNum(25, 35);var deg randomNum(-45, 45);//修改坐标原点和旋转角度ctx.translate(x, y);ctx.rotate(deg * Math.PI / 180);ctx.fillText(txt, 0, 0);//恢复坐标原点和旋转角度ctx.rotate(-deg * Math.PI / 180);ctx.translate(-x, -y);}/**绘制干扰线**/for (var i 0; i 3; i) {ctx.strokeStyle randomColor(40, 180);ctx.beginPath();ctx.moveTo(randomNum(0, width / 2), randomNum(0, height / 2));ctx.lineTo(randomNum(0, width / 2), randomNum(0, height));ctx.stroke();}/**绘制干扰点**/for (var i 0; i 50; i) {ctx.fillStyle randomColor(255);ctx.beginPath();ctx.arc(randomNum(0, width), randomNum(0, height), 1, 0, 2 * Math.PI);ctx.fill();}$(#code).val(code);return code;}});/scriptMVC中验证码
》》》定义一个生成验证码的类
public class VerifyCodeHelper{public static Bitmap CreateVerifyCode(out string code){//建立Bitmap对象绘图Bitmap bitmap new Bitmap(200, 60);Graphics graph Graphics.FromImage(bitmap);graph.FillRectangle(new SolidBrush(Color.White), 0, 0, 200, 60);Font font new Font(FontFamily.GenericSerif, 48, FontStyle.Bold, GraphicsUnit.Pixel);Random r new Random();string letters ABCDEFGHIJKLMNPQRSTUVWXYZ0123456789;StringBuilder sb new StringBuilder();//添加随机的五个字母for (int x 0; x 5; x){string letter letters.Substring(r.Next(0, letters.Length - 1), 1);sb.Append(letter);graph.DrawString(letter, font, new SolidBrush(Color.Black), x * 38, r.Next(0, 15));}code sb.ToString();//混淆背景Pen linePen new Pen(new SolidBrush(Color.Black), 2);for (int x 0; x 6; x)graph.DrawLine(linePen, new Point(r.Next(0, 199), r.Next(0, 59)), new Point(r.Next(0, 199), r.Next(0, 59)));return bitmap;}}》》》》Action /// summary/// 验证码 FileContentResult/// /summary/// returns/returns[AllowAnonymous]public ActionResult VerifyCode(){string code ;Bitmap bitmap VerifyCodeHelper.CreateVerifyCode(out code); //声明一个内存流 MemoryStream stream new MemoryStream();//把bitmap存入这个 流中bitmap.Save(stream, ImageFormat.Gif);// Controller中File方法 返回 FileContentResult // FileContentResult继承FileResultFileResult又继承 ActionResultreturn File(stream.ToArray(), image/gif);//返回FileContentResult图片}/// summary/// 验证码 直接写入Response/// /summary[AllowAnonymous]public void Verify(){string code ;Bitmap bitmap VerifyCodeHelper.CreateVerifyCode(out code);bitmap.Save(base.Response.OutputStream, ImageFormat.Gif);base.Response.ContentType image/gif;}在html页面中
