How to use JavaScript to determine whether a picture is loaded

Sometimes you need to get the size of the picture, which needs to be done after the picture is loaded. There are three ways to achieve it, as described below.

First, the Load event

<! DOCTYPE html>    
 
Test, all browsers display "loaded", which means that all browsers support the IMG Load event.
 
Ii. ReadyStateChange Incident
 
<! DOCTYPE html>    
 
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ReadyState for complete and loaded indicates that the picture has been loaded. The test Ie6-ie10 supports this event and is not supported by other browsers.
 
Three, the complete attribute of img
 
<! DOCTYPE html>    
 
Polling constantly monitors the IMG complete property, and if True indicates that the picture has been loaded and stops polling. This property is supported by all browsers.