I encountered a problem about iframes yesterday. For example, an iframe is embedded in a page called a_iframe. If the attribute setting is directly added to the label of a_iframe, onload='', only the onload event will work. Online After inquiring, the specific reason is unknown, but there is a solution:
1: Process through the onreadystatechange event of the iframe
2: Bind events to the iframe through the attachEvent method in IE
Only in this way can the onload event be truly bound to the corresponding iframe.