使用'window'对象的'getSelection'方法来检测点击并选中文本。

document.addEventListener('click', function(event) 
{
    // Check if the user has selected any text
    var selection = window.getSelection();
    if (selection.toString().length > 0)
    {
        // Get the selected text
        var selectedText = selection.toString();
        // Do something with the selected text...
    }
});