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JS Verification Code generation (entry level)

Source: Internet
Author: User
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Tag: Color round code cursor path generates height HTML func

Practiced hand project: JavaScript Verification Code

1 <!DOCTYPE HTML>2 <HTML>3 4     <Head>5         <MetaCharSet= "UTF-8">6         <title></title>7         <style>8 #mycanvas{9 cursor:Pointer;Ten             } One         </style> A     </Head> - <!--Place to optimize: random color of ① interference lines; ② can add a little bit of interference . - -     <Body> the         <CanvasID= "MyCanvas"width= ' All 'Height= ' + '> - your browser does not support canvas, please try a different browser ~ -         </Canvas> -     </Body> +  -     <Script> +         /*Generate 4-bit random numbers*/ A         functionrand () { at             varStr= "abcdefghijklmnopqrstuvwxyz0123456789"; -             vararr=Str.split (""); -             varValidate= ""; -             varRannum; -              for(varI= 0; I< 4; I++) { - Rannum=Math.floor (Math.random ()*  $); //random number between [0,35] in Validate+=Arr[rannum]; -             } to             returnValidate; +         } -  the         /*random x-coordinate value of the interference line*/ *         functionLineX () { $             varRanlinex=Math.floor (Math.random ()*  -);Panax Notoginseng             returnRanlinex; -         } the  +         /*random y-coordinate value of the interference line*/ A         functionLiney () { the             varRanliney=Math.floor (Math.random ()*  +); +             returnRanliney; -         } $  $         functionClickchange () { -             varMyCanvas=document.getElementById ('MyCanvas'); -             varCXT=Mycanvas.getcontext ('2d'); the Cxt.fillstyle= '#000'; - Cxt.fillrect (0, 0,  -,  +);Wuyi  the             /*generate 20 lines of interference*/ -              for(varJ= 0; J<  -; J++) { Wu Cxt.strokestyle= '#fff'; - Cxt.beginpath ();//if Beginpath is omitted, the number of lines of interference is accumulated for each click of the verification code. About Cxt.moveto (LineX (), Liney ()); $ Cxt.lineto (LineX (), Liney ()); - Cxt.linewidth= 0.5; - Cxt.closepath (); - Cxt.stroke (); A             } +  the Cxt.fillstyle= 'Yellow'; - Cxt.font= 'Bold 20px Arial'; $ Cxt.filltext (rand (), -,  -); //fills the random number text generated by rand () into the canvas the         } the  the Clickchange (); the  -         /*Click on the verification code to replace*/ in Mycanvas.onclick= function(e) { the E.preventdefault ();//prevent mouse clicks from occurring by default behavior the Clickchange (); About         }; the     </Script> the  the </HTML>

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JS Verification Code generation (entry level)

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