如何找到 HTML 文件中的最高 Z 索引？

Finding the Highest Z-Index in Your Document

While setting a DIV to the highest z-index may seem like a simple task, choosing a number arbitrarily can lead to unexpected results. To approach this issue systematically, let's delve into a scientific method for identifying the highest z-index in your document.

In modern browsers, you can manipulate the z-index through the DOM (Document Object Model). The z-index property specifies the stacking order of HTML elements, with higher values indicating elements that appear above others.

To find the maximum z-index, you can leverage JavaScript to inspect the live document. Here's a code snippet borrowed from abcoder.com:

var maxZ = Math.max.apply(null,
    $.map($('body *'), function(e, n) {
        if ($(e).css('position') != 'static')
            return parseInt($(e).css('z-index')) || 1;
    })
);

This code iterates through all elements in the document, considering only those with a non-static position. It then extracts their z-index values and returns the highest value using the Math.max function.

By using this approach, you can dynamically determine the maximum z-index in your document and overcome the limitations of guessing or picking arbitrary numbers.

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