<!DOCTYPE?html>
<html>
<head>
????<meta?charset="UTF-8">
????<title>Document</title>
</head>
<body?onload="pageLoaded();">
????<script?language="javascript">
????function?pageLoaded()?{
????????var?txt?=?"105.75,29.47?105.74,29.5?105.77,29.53?105.77,29.53?105.83,29.52";
????????var?array?=?txt.split("?");
????????//get?canvas?by?id
????????var?canvas?=?document.getElementById('tCanvas');
????????//get?2d?environment
????????var?context?=?canvas.getContext('2d');
????????//draw?polygon
????????context.beginPath();
????????context.moveTo(105.81,?29.47);
????????for?(var?a?=?0;?a?<?array.length;?a++)?{
????????????context.lineTo(array[a]);
????????????//alert(array[a]);
????????};
????????context.closePath();
????????context.stroke();
????}
????</script>
????<canvas?width="400"?height="400"?id="tCanvas"?style="border:black?1px?solid;">
????</canvas>
</body>
</html>
2016-09-30
第22行，你傳進(jìn)去的一個(gè)字符串，一個(gè)參數(shù)，但是這個(gè)接口需要的是兩個(gè)參數(shù)，打開控制臺就可以看到錯(cuò)誤
2016-09-30
for (var a = 0; a < array.length; a++) {
? ? ? ? var a=array[a].split(',');
? ? ? ? ? ? context.lineTo(a[0],a[1]);
? ? ? ? ? ? //alert(array[a]);
? ? ? ? };