Extjs gridpanel 出现横向滚动条问题的解决方法

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); 
} 
}