Example of JS proportionally reducing image size_javascript skills

In order to improve user experience, when website users upload images, we cannot allow users to process the images themselves to meet our requirements.

Usually for pages like the physical display of goods on Taobao, the main thing we need to control is the width of the image.

Considering some problems that may be caused by the parsing order of HTML pages, we decided to implement it by defining a simple function and then adding an onload event to the img element to call it. The code is as follows:

JS part

Copy code The code is as follows:

HTML calling part

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The code is as follows: