JS画线，虽然很原始，但是兼容所有浏览器
用Javascript画线的方法很多，有SVG，VML、canvas等，但是在现阶段，貌似这些方法都不能兼容所有浏览器。所以我还是用最原始的办法法写了一个画线方法。思路也很简单，就是用一个像素的DIV拼成一条线。
function line(startX, startY, endX, endY, container) {if (startX == endX) {if (startY > endY) {var tempY = startY;startY = endY;endY = tempY;}for (var k = startY; k < endY; k++) {createPoint(container, startX, k);}}// y = ax + bvar a = (startY - endY) / (startX - endX);var b = startY - ((startY - endY) / (startX - endX)) * startX;if (Math.abs(startX - endX) > Math.abs(startY - endY)) {if (startX > endX) {var tempX = endX;endX = startX;startX = tempX;}var left = container.style.left;var top = container.style.top;for (var i = startX; i <= endX; i++) {createPoint(container, i, a * i + b);}} else {if (startY > endY) {var tempY = startY;startY = endY;endY = tempY;}for (var j = startY; j <= endY; j++) {createPoint(container, (j - b) / a, j);}}}function createPoint(container, x, y) {var node = document.createElement('div');node.className = 'line';node.style.marginTop = y;node.style.marginLeft = x;container.appendChild(node);}?
当然还需要一段CSS来控制样式：
div.line {position:absolute;z-index:2;width:1px;height:1px;font-size:1px;background-color:#0000FF;overflow:hidden;}?
来一段HTML测试一下
<html><head><script type="text/javascript" src="../js/jsline.js"></script><script type="text/javascript">function testLine() {line(1, 2, 88, 88, document.getElementById('container'));}</script></head><body><div id="container" style="width:400px;height:400px;border:1px solid #000000;margin-left:50px"></div><input type="button" value="line" onclick="testLine();"></input></body></html>?
最后还是希望HTML5早日普及，我这种写法早日淘汰！