问答详情
源自：2-2 绘制直线、多边形和七巧板

为啥我的没有效果？代码一模一样呀！！郁闷

<!DOCTYPE html>

<html>

<head>

<title></title>

</head>

<body>

<canvas id="canvas"  style="border:1px solid #aaa;diplay:block;margin:50px auto;" > </canvas>

<script >

var tangram=[

{p:[{x:0,y:0},{x:800,y:0},{x:400,y:400}],color:"#caff67"},

{p:[{x:0,y:0},{x:400,y:400},{x:0,y:800}],color:"#67becf"},

{p:[{x:800,y:0},{x:800,y:400},{x:600,y:600},{x:600,y:200}],color:"#ef3d61"},

{p:[{x:600,y:200},{x:600,y:600},{x:400,y:400}],color:"f9f51a"},

{p:[{x:400,y:400},{x:600,y:600},{x:400,y:800},{x:200,y:600}],color:"#a594c0"},

{p:[{x:200,y:600},{x:400,y:800},{x:0,y:800}],color:"#fa8ecc"},

{p:[{x:800,y:400},{x:800,y:800},{x:400,y:800}],color:"#f6ca29"}

]

window.onload=function(){

var canvas=document.getElementById("canvas");

canvas.width=800;

canvas.height=800;

var context=canvas.getContext("2d");

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=1;i<piece.length;i++)

cxt.lineTo(piece.p[i].x,piece,p[i].y);

cxt.closePath();

cxt.fillStyle=piece.color;

cxt.fill();


cxt.trokeStyle="black"

cxt.lineWidth=3;

cxt.stroke();



}

</script>

</body> 

</html>


提问者：白书黑影 2015-08-22 10:06

个回答

  • qq_jk_10
    2015-09-08 12:06:57

    哦  看错了  已经解决  老师的代码有点不严谨啊

    0
  • qq_jk_10
    2015-09-08 11:24:21

    不对啊 我如果给for循环加上 {}这个就不行 

    但是如果跟老师一样不加上{}才能运行出来啊 

    0
  • 白书黑影
    2015-08-22 10:16:42

    <!DOCTYPE html>

    <html>

    <head>

    <title></title>

    </head>

    <body>

    <canvas id="canvas"  style="border:1px solid #aaa;diplay:block;margin:50px auto;" > </canvas>

    <script >

    var tangram=[

    {p:[{x:0,y:0},{x:800,y:0},{x:400,y:400}],color:"#caff67"},

    {p:[{x:0,y:0},{x:400,y:400},{x:0,y:800}],color:"#67becf"},

    {p:[{x:800,y:0},{x:800,y:400},{x:600,y:600},{x:600,y:200}],color:"#ef3d61"},

    {p:[{x:600,y:200},{x:600,y:600},{x:400,y:400}],color:"f9f51a"},

    {p:[{x:400,y:400},{x:600,y:600},{x:400,y:800},{x:200,y:600}],color:"#a594c0"},

    {p:[{x:200,y:600},{x:400,y:800},{x:0,y:800}],color:"#fa8ecc"},

    {p:[{x:800,y:400},{x:800,y:800},{x:400,y:800}],color:"#f6ca29"}

    ];

    window.onload=function(){

    var canvas=document.getElementById("canvas");

    canvas.width=800;

    canvas.height=800;

    var context=canvas.getContext("2d");

    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=1;i<piece.p.length;i++){

    cxt.lineTo(piece.p[i].x,piece.p[i].y);

    };

    cxt.closePath();


    cxt.fillStyle=piece.color;

    cxt.fill();


    cxt.trokeStyle="black"

    cxt.lineWidth=3;

    cxt.stroke();



    }

    }





    </script>

    </body> 

    </html>

    正确的代码 

    0