Detailed explanation of the second parameter of jQuery() method_jquery

Regarding the second parameter of the jQuery() method, there are the following usages:

1.jQuery(selector, [context])

This usage is equivalent to $(context).find(selector) or context.find(selector)

2.jQuery(html, [ownerDocument])

The document’s explanation of ownerDocument is: “Create the document where the DOM element is located”

In other words, if you want to write scripts for document, such as iframe or open a new window using window.open, you may need it

3.jQuery(html, props)

This should be more commonly used, just paste the code directly:

$("<input>", {

 type: "text",

 val: "Test",

 focusin: function() {

  $(this).addClass("active");

 },

 focusout: function() {

  $(this).removeClass("active");

 }

}).appendTo("form")

That is to say, the attributes in props will be set to the newly created tag like the .attr() method

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