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1. Use the mouse to drag to change the size
2. Use the mouse to scroll to control the image size
3. Use code to control the size of the image tag
After testing, it needs to be modified, otherwise the image will display the original size when the web page is refreshed.
4. CSS control image size
1. css2 direct implementation: img{max-width: 500px;} (IE is not supported yet)
2. expression implementation: img{width:expression(width>500?"500px":width);} (IE only)
3. Use js. Method: Use document.getElementsByTagName("IMG") to get all img elements Traverse the img element to determine its width and perform corresponding operations
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