為什么我這畫出來只有四塊呢
<script>
? ?var tangram=[
? ? ? ?{p:[{x:0,y:0},{x:300,y:0},{x:150,y:150}],color:"#caff67"},
? ? ? ?{p:[{x:0,y:0},{x:150,y:150},{x:0,y:300}],color:"#67becf"},
? ? ? ?{p:[{x:300,y:0},{x:300,y:150},{x:225,y:225},{x:225,y:75}],color:"#ef3d61"},
? ? ? ?{p:[{x:225,y:75},{x:225,y:225},{x:150,y:150}],color:"#f9f51a"},
? ? ? ?{p:[{x:150,y:150},{x:225,y:225},{x:150,y:300},{x:75,y:225}],color:"#a594c0"},
? ? ? ?{p:[{x:75,y:225},{x:150,y:300},{x:0,y:300}],color:"#fa8ecc"},
? ? ? ?{p:[{x:300,y:150},{x:300,y:300},{x:150,y:300}],color:"#f6ca29"},
? ?];
? ?window.onload=function(){
? ? ? ?var canvas=document.getElementById("canvas");
? ? ? ?if(canvas.getContext("2d")){
? ? ? ?var context=canvas.getContext("2d");}else{
? ? ? ? ? ?alert("當前瀏覽器不支持canvas，請更換瀏覽器后再試");
? ? ? ?}
? ? ? ?for(var i=0;i<tangram.length;i++){
? ? ? ? ? ?draw(tangram[i],context);
? ? ? ?}
? ? ? ?function draw(piece,cxt){
? ? ? ? ? ?cxt.beginPath();
? ? ? ? ? ?cxt.moveTo(piece.p[0].x,piece.p[0].y);
? ? ? ? ? ?for(var i=0;i<piece.p.length;i++){
? ? ? ? ? ? ? ?cxt.lineTo(piece.p[i].x,piece.p[i].y);
? ? ? ? ? ?}
? ? ? ? ? ?cxt.closePath();
? ? ? ? ? ?cxt.fillStyle=piece.color;
? ? ? ? ? ?cxt.fill();
? ? ? ?}
? ?}
</script>
2015-12-02
<!DOCTYPE?html> <html> <head> ????<meta?charset="UTF-8"> ????<title>xxxx</title> ????<script> ????????var?tangram=[ ????????????{p:[{x:0,y:0},{x:300,y:0},{x:150,y:150}],color:"#caff67"}, ????????????{p:[{x:0,y:0},{x:150,y:150},{x:0,y:300}],color:"#67becf"}, ????????????{p:[{x:300,y:0},{x:300,y:150},{x:225,y:225},{x:225,y:75}],color:"#ef3d61"}, ????????????{p:[{x:225,y:75},{x:225,y:225},{x:150,y:150}],color:"#f9f51a"}, ????????????{p:[{x:150,y:150},{x:225,y:225},{x:150,y:300},{x:75,y:225}],color:"#a594c0"}, ????????????{p:[{x:75,y:225},{x:150,y:300},{x:0,y:300}],color:"#fa8ecc"}, ????????????{p:[{x:300,y:150},{x:300,y:300},{x:150,y:300}],color:"#f6ca29"}, ????????]; ????????window.onload=function(){ ????????????var?canvas=document.getElementById("canvas"); ????????????if(canvas.getContext("2d")){ ????????????????var?context=canvas.getContext("2d");}else{ ????????????????alert("當前瀏覽器不支持canvas，請更換瀏覽器后再試"); ????????????} ????????????for(var?i=0;i<tangram.length;i++){ ????????????????draw(tangram[i],context); ????????????} ????????????function?draw(piece,cxt){ ????????????????cxt.beginPath(); ????????????????cxt.moveTo(piece.p[0].x,piece.p[0].y); ????????????????for(var?i=0;i<piece.p.length;i++){ ????????????????????cxt.lineTo(piece.p[i].x,piece.p[i].y); ????????????????} ????????????????cxt.closePath(); ????????????????cxt.fillStyle=piece.color; ????????????????cxt.fill(); ????????????} ????????} ????</script> </head> <body> <canvas?id="canvas"?width="500px"?height="500px"></canvas> </body> </html>你的代碼 ?我什么也沒有改，是沒有問題。