代碼不通過
? window.onload = function(){
??????? var canvas = document.getElementById("canvas");
??????? canvas.width = 800;
??????? canvas.height = 800;
??????? var cxt=canvas.getContext('2d');
??????? cxt.moveTo(10,10);
??????? cxt.lineTo(100,400);
??????? cxt.lineWidth=3;
??????? cxt.strokeStyle="rgba(0,0,0,0.5)";
??????? cxt.stroke();
??? }
2016-01-09
因?yàn)闄z測(cè)的是“context”。。。所以改一下命名就好了
2015-12-15
是不是你代碼的位置放置的不對(duì)啊