Thank you very much! It's the effect what I want !!
But for more, if I want the draggable image :
1. Still the full-screen image, drag the image to the left, it will stop when the right border of the image appears，and vice versa.
2. Not the full-screnn image, but a wide image which I want limit it in a "container"(maybe in a Rectangle). The part of the image which exceed the "container"'s border will be hiden. Along with dragging, it will appear from left to right or right to left.
Here's the source file, draggable-2.zip (455.3 KB) I marked the keypoint on it. I'm ashamed of my poor JS/JQ knowledge...If you have some idea using JS/JQ to achieve it, thank you very much!!!