js to get window object implementation method in iframe

jQuery gets the window object of iframe

var win = $('#ifr')[0].contentWindow;

JS native method to get window object of iframe

document.getElementById("ifr").contentWindow;

It can be seen that $('#ifr')[0].contentWindow and document.getElementById("ifr") are equivalent

Looking at the following situation

var ifr1 = document.getElementById("ifr");

var ifr2 = window.frames[0];

ifr2.frameElement is equivalent to ifr1;

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