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<style>
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background:pink;
}
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background:white;
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{
var oC = document.getElementById(‘c1‘);
var oGC = oC.getContext(‘2d‘);
oC.onmousedown = function (ev)
{
var ev = ev || event;
oGC.moveTo(ev.clientX - oC.offsetLeft, ev.clientY - oC.offsetTop);
document.onmousemove = function (ev)
{
var ev = ev || event;
oGC.lineTo(ev.clientX - oC.offsetLeft, ev.clientY - oC.offsetTop);
oGC.stroke();
}
document.onmouseup = function ()
{
document.onmousemove = null;
document.onmouseup = null;
}
}
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<body>
<canvas id="c1" width="400" height="300">
<span>请升级您的浏览器</span>
</canvas>
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时间： 2024-10-25 12:22:40