Method _getHeight

src/common/overlay/levelRenderer/Painter.js:712–720

* Method: _getHeight *

()

     *
     */
    _getHeight() {
        var root = this.root;
        var stl = root.currentStyle
            || document.defaultView.getComputedStyle(root);

        return ((root.clientHeight || parseInt(stl.height, 10))
            - parseInt(stl.paddingTop, 10) // 请原谅我这比较粗暴
            - parseInt(stl.paddingBottom, 10)).toFixed(0) - 0;
    }


    /**