使用var作为属性中的值来选择元素

Question

您对此代码的查找解决方案没有什么问题：

class workerThread extends Thread
{
    private $document;
    private $i;

    public function __construct($i)
    {
        $this->i = $i;
    }

    public function run()
    {
        $document = new DOMDocument();

        try {
            $root = $document->createElement("Root");
            $document->appendChild($root);
        } catch (RuntimeException $e) {
            return false;
        }

        $this->document = $document->saveXML();
    }

    public function getRoot()
    {
        $document = new DOMDocument();
        $document->loadXML($this->document);

        return $document->documentElement;
    }
}

如何用data-value-select =（此attrVal）选择元素？