window.onload=function(){

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

canvas.width=400;

canvas.height=400;

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

for (var i=0;i<tangram.length;i++)?

draw(tangram[i],ctxt);

}

//繪制圖形 ?每一塊圖形，上下文對(duì)象

function draw(graph,ctxt){

ctxt.beginPath();

//當(dāng)前圖形的起始坐標(biāo)

ctxt.moveTo(graph.p[0].x,graph.p[0].y);//這一行運(yùn)行一半報(bào)錯(cuò)

for (var i=1;i<graph.p.length;i++)?

ctxt.lineTo(graph.p[i].x,graph.p[i].y);

ctxt.closePath();

//設(shè)置圖形顏色

ctxt.fillStyle=graph.color;

ctxt.fill();

}