js code to check the size, dimension, format and preview before uploading the image_Image special effects

The following code needs to be saved locally for execution, and the actual effect cannot be seen online.

<title>validate before upload by Lance Zhang</title> <form name="Myform"> <p> <font color="red" size="6">File type:gif,jpg,jpeg,png,bmp</font></p> <p> File size limit: <input type="text" size="4" value="100" name="fileSizeLimit" id="fileSizeLimit"> K</p> <p> Image Height Limit: <input type="text" size="4" value="100" name="heightLimit" id="heightLimit"> </p> <p> Image Width Limit: <input type="text" size="4" value="100" name="widthLimit" id="widthLimit"> </p> <p> <input type="file" name="photo" onchange="changeSrc(this)"> Image Preview<img src="about:blank" id="fileChecker" name="fileChecker" alt="js code to check the size, dimension, format and preview before uploading the image_Image special effects"> </p> <p> <input type="submit" value="submit"> </p> </form>
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