Jquery method to query the element "z-index": 1. Use the "$(element)" statement to obtain the specified element object; 2. Use the css() method to return the "z-index" attribute of the specified element Value, the syntax is "element object.css("z-index")".

The operating environment of this tutorial: windows10 system, jquery3.2.1 version, Dell G3 computer.

How jquery queries z-index

css() method sets or returns one or more style attributes of the selected element.

Return the value of the specified CSS property, the syntax is as follows:

css("propertyname");

The example is as follows:

This is a heading

由于图像的 z-index 是 -1，因此它在文本的后面出现。
返回img元素的z-index

Output result:

After clicking the button:

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