Javascript 画布中的鼠标移动,带有视频问题
我有以下代码,可以使用mousemove在画布上随意移动图像:Javascript 画布中的鼠标移动,带有视频问题,javascript,jquery,css,html,canvas,Javascript,Jquery,Css,Html,Canvas,我有以下代码,可以使用mousemove在画布上随意移动图像: <!DOCTYPE html> <head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <style type="text/css"> #canvas { padding: 0px; mar
<!DOCTYPE html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<style type="text/css">
#canvas {
padding: 0px;
margin: 0px;
top:0;
left:0;
z-index: 30;
position: absolute;
width: 50%;
height: 50%;
}
</style>
</head>
<body>
<video id="video" autoplay="true" loop="true" >
<source src="video/xyz.ogg" type="video/ogg" />
<source src="video/xyz.mp4" type="video/mp4" />
<canvas id="canvas"></canvas>
<script>
document.addEventListener('DOMContentLoaded', function(){
var v = document.getElementById('video');
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var canvas = $('canvas');
canvas.mousemove(function(e){
$('#imgFollow').offset({left:e.pageX-20,top:e.pageY+10});
});
</script>
<a id="imgFollow"><img width="75px" height="75px"
src="http://i.imgur.com/Jwhcy45.png" class="canvas"/></a>
</body>
</html>
但当我用这个在画布上绘制视频时:
document.addEventListener('DOMContentLoaded', function(){
var v = document.getElementById('video');
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
//var cw = Math.floor(canvas.clientWidth / 100);
//var ch = Math.floor(canvas.clientHeight / 100);
var cw = Math.floor(canvas.clientWidth);
var ch = Math.floor(canvas.clientHeight);
canvas.width = cw;
canvas.height = ch;
v.addEventListener('play', function(){
draw(this,context,cw,ch);
},false);
},false);
function draw(v,c,w,h) {
if(v.paused || v.ended) return false;
c.drawImage(v,0,0,w,h);
setTimeout(draw,20,v,c,w,h);
}
var canvas = $('canvas');
canvas.mousemove(function(e){
$('#imgFollow').offset({left:e.pageX-20,top:e.pageY+10});
});
</script>
<a id="imgFollow"><img width="75px" height="75px"
src="http://i.imgur.com/Jwhcy45.png" class="canvas"/></a>" class="canvas"/></a>`
然后使用mousemove在上面移动图像,它不会在视频上显示图像。
我能看穿它工作的一面,但不能通过视频显示。有什么答案或建议吗?如果你能从侧面看到图像,我觉得这就像是css Z索引问题。看看这里,试试看,以防出现问题。z索引值越高,图像将显示在顶部的视频的z索引值越高-谢谢你,亲爱的,它工作了!!!