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:0},{x:600,y:600},{x:600,y:200}],color:"#ef3d61"},

{p:[{x:600,y:200},{x:600,y:600},{x:400,y:400}],color:"#f9f5la"},

{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);

//alert('aaaa')

}

}

function draw(piece,cxt){

cxt.beginPath();

cxt.moveTo(piece.p[0].x,piece.p[0].y);

for(var i=1 ; i<piece.p.lenght ; i++ ){

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

cxt.closePath();

cxt.fillStyle=piece.color;

cxt.fill();//填充色

}

}