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How does JavaScript determine whether an image has been loaded in order to obtain its size_javascript skills

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Release： 2016-05-16 16:49:20

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Sometimes it is necessary to obtain the size of an image. This needs to be done after the image is loaded. How can I do this?

1. Load event

Copy code The code is as follows:

< !DOCTYPE HTML>

img - load event

Tested, all browsers show "loaded" indicates that all browsers support the load event of img.

2. readystatechange event

Copy code The code is as follows:

< !DOCTYPE HTML>

img - readystatechange event

readyState is complete and loaded indicates that the image has been loaded. Tested that IE6-IE10 support this event, other browsers do not support it.

3. Complete attribute of img

Copy code The code is as follows:

img - complete attribute

Polling continuously monitors the complete attribute of img. If it is true, it indicates that the image has been loaded and stops polling. This attribute is supported by all browsers.

Related labels：

Image loading size of the picture

source：php.cn

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