iframe page elements call each other

• Sometimes it is necessary to nest the content of another page in the interface. At this time, iframe tags are often used to quote
• During data interaction, internal page elements may be called on the external page of the iframe, or external page elements may be called on the internal page of the iframe

External call internal:

$('iframe的ID值').contents().find("内部页面需要寻找的元素")

Internal call external:

$(window.parent.document).contents().find("外部页面需要寻找的元素")