我想使用toDataURL()獲取圖像數據,但是我的Imagedraw()方法不起作用。canvas imageDraw()不工作
var video = document.getElementById('media-video');
var videoCurrentTime = document.getElementById('media-video').currentTime;
var canvasWidth = $('video').width();
var canvasHeight = $('video').height();
var c = $('body').append($('<canvas>',{id: 'myCanvas', width:canvasWidth, height:canvasHeight}));
var ctx;
$(document).ready(function() {
c = document.getElementById('myCanvas');
ctx = c.getContext("2d");
});
c.onload=function(){
ctx.drawImage(video, 0, 0,canvasWidth , canvasHeight);
}
imageData = c.toDataURL("image/jpeg",1.0);
window.open(imageData, "toDataURL() image", "width=600, height=200");
}
我可以看到imageData中返回的空白畫布。
我已經試過了,提供靜態值 – arun
上面的代碼在iframe中。它與它有什麼關係? – arun