Rumah >hujung hadapan web >Tutorial H5 >Imej latar belakang kecerunan lukisan HTML5 dan memuat turun secara automatik langkah-langkah pelaksanaan_html5 kemahiran tutorial

Imej latar belakang kecerunan lukisan HTML5 dan memuat turun secara automatik langkah-langkah pelaksanaan_html5 kemahiran tutorial

WBOY
WBOYasal
2016-05-16 15:48:351594semak imbas

drawBgLine.html

Salin kod
Kodnya adalah seperti berikut:




html5 melukis imej latar belakang kecerunan dan memuat turun secara automatik</title< ;/ kepala> <br><badan> <br> <tengah> ;/ center> <br> <skrip> <br> //Langkah 1: Dapatkan objek kanvas <br> var c = document.getElementById("c"); objek kanvas <br> var context = c.getContext("2d"); <br> /* <br> * Ini adalah kod untuk melukis grafik lain <br> context.beginPath(); =10; <br> context.strokeStyle="red"; <br> context.moveTo(50,50); context.closePath( ); <br> //context.strokeRect(220,50,50,50); ; <br> context.beginPath(); <br> context.arc(150,150,50,0*Math.PI/180,-180*Math.PI/180,false); ; <br> context.closePath(); <br> context.stroke(); <br> context.lineWidth=1; ,0,220); <br> context.save(); <br> context.translate(50,50); <br> konteks .lineWidth=10; <br> context.strokeStyle="red"; <br> context.moveTo(0,0); (); <br> context.closePath(); <br> context.restore(); 0,"90BFFF "); <br> g.addColorStop(1,"white"); <br> context.fillStyle = g; <br> context.fillRect(0,0,1,200); = c.toDataURL ("image/jpeg").replace("image/jpeg","image/octet-stream"); ​​​​<br> </script> <br></body> <br> </div></div><div class="nphpQianMsg"><div class="clear"></div></div><div class="nphpQianSheng"><span>Kenyataan:</span><div>Kandungan artikel ini disumbangkan secara sukarela oleh netizen, dan hak cipta adalah milik pengarang asal. 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