Value transfer between Iframes in JS and application between subpages and parent pages_javascript skills

In js, we often use iframe as the system framework. In child pages, value transfer between parent pages is a problem. The following is js to obtain the object js of the parent form and child form:

1. Get the elements of the parent page in the iframe subpage :
a> window.parent.document is to get the object in the document of the parent page;
b> If you want to get Methods in parent page js: window.parent.xxxx(); a>


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The code is as follows: var child = document.getElementByIdx_x("mainFrame" ).contentWindow;//The id of mainFrame is the id of the parent page iframe child.document;//Get the document object in the child page;