![\"node_code\"](\"https:\/\/sdeno.com\/wp-content\/uploads\/2016\/10\/node_code.jpg\" "\\"node_code\\"")
<\/figure><\/a>\n<\/p>\n
\u4ee5\u4e0b\u65b9\u6cd5\u5728ubuntu\u4e0b\u8fdb\u884c\u7684<\/p>\n
\u5b89\u88c5\uff1a<\/p>\n
npm install ccap --save<\/pre>\n<\/p>\n
express\u5236\u4f5c\u9a8c\u8bc1\u7801\u56fe\u7247\uff1a<\/span><\/p>\n
var ccap = require('ccap')();\r\n\r\n\r\n\r\nvar obj={};\r\n\/\/\u9a8c\u8bc1\u7801\r\nrouter.get('\/code_img', function(req, res, next) {\r\n var ary = ccap.get();\r\n var txt = ary[0];\r\n var buf = ary[1];\r\n res.end(buf) \/\/\u663e\u793a\u9a8c\u8bc1\u7801\u56fe\u7247\r\n obj.code=txt; \/\/\u9a8c\u8bc1\u7801\u6570\u5b57\r\n});\r\n\r\n\r\n\u5176\u4ed6\u6a21\u5757\u8c03\u7528\u83b7\u53d6\u9a8c\u8bc1\u7801\u6570\u5b57\u4f7f\u7528\uff1aobj.code<\/pre>\n<\/p>\n
\u663e\u793a\u9a8c\u8bc1\u7801\u56fe\u7247\uff1a<\/p>\n
<img src=\"code_img\" onclick=\"this.src='code_img?'+Math.random();\"><\/pre>\n<\/p>\n
<\/p>\n
koa2\u9a8c\u8bc1\u7801<\/span><\/p>\n
\u5b89\u88c5\uff1a<\/p>\n
npm install ccap --save<\/pre>\n<\/p>\n
var ccap = require('ccap')();\r\n\r\n\r\nrouter.get('\/code_img', async function (ctx, next) {\r\n\r\n return next().then(() => {\r\n let ary = ccap.get();\r\n let txt = ary[0];\r\n let buf = ary[1];\r\n ctx.body = buf; \/\/\u76f4\u63a5\u8f93\u51fa\u56fe\u7247\r\n ctx.type = 'image\/png';\r\n ctx.session.captcha = txt; \/\/\u8fd9\u91cc\u53ef\u80fd\u9700\u8981\u52a0\u8f7dsession\u6a21\u5757\uff0c\u8f93\u51fa\u9a8c\u8bc1\u7801\uff0c\u5728\u522b\u7684\u6a21\u5757\u8c03\u7528\u53c2\u4e0e\u767b\u9646\u903b\u8f91\u9a8c\u8bc1\r\n });\r\n\r\n})\r\n\r\n\r\n<\/pre>\n<\/p>\n
<\/p>\n
\u63a8\u8350\u4f7f\u7528<\/p>\n
npm install gd-bmp<\/pre>\n<\/p>\n
\u8c03\u7528\uff1a<\/p>\n
var fs = require('fs');\r\nconst BMP24 = require('gd-bmp').BMP24;\/\/gd-bmp\r\n\r\n\r\n\r\n\/\/\u4effPHP\u7684rand\u51fd\u6570\r\nfunction rand(min, max) {\r\n return Math.random()*(max-min+1) + min | 0; \/\/\u7279\u6b8a\u7684\u6280\u5de7\uff0c|0\u53ef\u4ee5\u5f3a\u5236\u8f6c\u6362\u4e3a\u6574\u6570\r\n}\r\n\r\n\/\/\u5236\u9020\u9a8c\u8bc1\u7801\u56fe\u7247\r\nfunction makeCapcha() {\r\n var img = new BMP24(100, 40);\r\n img.drawCircle(rand(0, 100), rand(0, 40), rand(10 , 40), rand(0, 0xffffff));\r\n \/\/\u8fb9\u6846\r\n img.drawRect(0, 0, img.w-1, img.h-1, rand(0, 0xffffff));\r\n img.fillRect(rand(0, 100), rand(0, 40), rand(10, 35), rand(10, 35), rand(0, 0xffffff));\r\n img.drawLine(rand(0, 100), rand(0, 40), rand(0, 100), rand(0, 40), rand(0, 0xffffff));\r\n \/\/return img;\r\n\r\n \/\/\u753b\u66f2\u7ebf\r\n var w=img.w\/2;\r\n var h=img.h;\r\n var color = rand(0, 0xffffff);\r\n var y1=rand(-5,5); \/\/Y\u8f74\u4f4d\u7f6e\u8c03\u6574\r\n var w2=rand(10,15); \/\/\u6570\u503c\u8d8a\u5c0f\u9891\u7387\u8d8a\u9ad8\r\n var h3=rand(4,6); \/\/\u6570\u503c\u8d8a\u5c0f\u5e45\u5ea6\u8d8a\u5927\r\n var bl = rand(1,5);\r\n for(var i=-w; i<w; i+=0.1) {\r\n var y = Math.floor(h\/h3*Math.sin(i\/w2)+h\/2+y1);\r\n var x = Math.floor(i+w);\r\n for(var j=0; j<bl; j++){\r\n img.drawPoint(x, y+j, color);\r\n }\r\n }\r\n\r\n var p = \"ABCDEFGHKMNPQRSTUVWXYZ3456789\";\r\n var str = '';\r\n for(var i=0; i<5; i++){\r\n str += p.charAt(Math.random() * p.length |0);\r\n }\r\n\r\n var fonts = [BMP24.font8x16, BMP24.font12x24, BMP24.font16x32];\r\n var x = 15, y=8;\r\n for(var i=0; i<str.length; i++){\r\n var f = fonts[Math.random() * fonts.length |0];\r\n y = 8 + rand(-10, 10);\r\n img.drawChar(str[i], x, y, f, rand(0, 0xffffff));\r\n x += f.w + rand(2, 8);\r\n }\r\n return {img:img,font:str};\r\n}\r\n\r\n\r\n\r\nrouter.get('\/code_img', async function (ctx, next) {\r\n\r\n return next().then(() => {\r\n var img = makeCapcha();\r\n ctx.body = img.img.getFileData();\r\n ctx.type = 'image\/bmp';\r\n ctx.session.captcha = img.font;\r\n });\r\n\r\n})<\/pre>\nhttps:\/\/github.com\/zengming00\/node-gd-bmp\u00a0<\/a><\/p>\n