jQuery - 在继续之前等待图像加载

In the application I'm currently working on, I have 2 HTML5 Canvases that I'm using. One (TempCanvas) is for drawing charts temporarily and the other (MainCanvas) is for transferring the charts onto it for presentation. I have an image that I'm trying to draw onto TempCanvas, then when it's loaded I'd like to draw TempCanvas onto MainCanvas. In the application I'm currently working on, I