您只能使用Canvas将图像或视频帧捕获为屏幕截图.但是如果要捕获网页上的特定元素,请尝试以下库：
html2canvas
这是代码：
注意：在drawImage()函数中仔细调整尺寸
$(".drag").draggable();
$(".drag").droppable();
var takeScreenShot = function() {
html2canvas(document.getElementById("container"), {
onrendered: function (canvas) {
var tempcanvas=document.createElement('canvas');
tempcanvas.width=350;
tempcanvas.height=350;
var context=tempcanvas.getContext('2d');
context.drawImage(canvas,112,0,288,200,0,0,350,350);
var link=document.createElement("a");
link.href=tempcanvas.toDataURL('image/jpg'); //function blocks CORS
link.download = 'screenshot.jpg';
link.click();
}
});
}
#container{
width:400px;
height:200px;
}
#rightcontainer{
width:300px;
height:200px;
background:gray;
color:#fff;
margin-left:110px;
padding:10px;
}
#leftmenu{
color:#fff;
background-color:green;
width:100px;
height:200px;
position:fixed;
left:0;
padding:10px;
}
button{
display:block;
height:20px;
margin-top:10px;
margin-bottom:10px;
}
.drag{
width:40px;
height:20px;
background-color:blue;
z-index:100000;
margin-top:10px;
}
Snapshot
Left Side
Drag----------->
&
Click Snapshot
Right Side
