Extjs GridPanel横向滚动条解决方案

viewConfig : { 
    layout : function() { 
        if (!this.mainBody) { 
            return; // not rendered 
        } 
        var g = this.grid; 
        var c = g.getGridEl(); 
        var csize = c.getSize(true); 
        var vw = csize.width; 
        if (!g.hideHeaders && (vw < 20 || csize.height < 20)) { // display: none 
            return; 
        } 
        if (g.autoHeight) { 
            if (this.innerHd) { 
                this.innerHd.style.width = (vw) + 'px'; 
            } 
        } else { 
            this.el.setSize(csize.width, csize.height); 
            var hdHeight = this.mainHd.getHeight(); 
            var vh = csize.height - (hdHeight); 
            this.scroller.setSize(vw, vh); 
            if (this.innerHd) { 
                this.innerHd.style.width = (vw) + 'px'; 
            } 
        } 
        if (this.forceFit) { 
            if (this.lastViewWidth != vw) { 
                this.fitColumns(false, false); 
                this.lastViewWidth = vw; 
            } 
        } else { 
            this.autoExpand(); 
            this.syncHeaderScroll(); 
        } 
        this.onLayout(vw, vh); 
    } 
}