ExtJS让页面最下面的panel自适应高度和宽度

getGridHeight = function(panelNameOne, panelNameTwo, panelThree) {
//获取页面最下面的grid的高度，可以根据分辨率来自定义设置，根据项目需要估计在grid上面最多有三个panel
//如果第二个和第三个panel没有传入值的话，需要传入'0'来补齐，
//方法返回值就是你的grid的高度，如果根据分辨率返回值的值小于零，那么就会传出一个150的高度。
var gridHeight = '';
if (panelNameOne != '0' && panelNameTwo != '0' && panelThree == '0') {
  //表明页面有三个panel，需要的到第三个panel的高度
   var tabPanelHeight = Ext.getCmp('MainTabPanel').getSize().height;
   var panel1Height = panelNameOne.getSize().height;
   var panel2Height = panelNameTwo.getSize().height;
   var gridHeight = tabPanelHeight - panel1Height - panel2Height - 31;
}
if (panelNameOne != '0' && panelNameTwo == '0' && panelThree == '0') {
  //表明页面有两个panel，需要的到第二个panel的高度
   var tabPanelHeight = Ext.getCmp('MainTabPanel').getSize().height;
   var panelHeight = panelNameOne.getSize().height;
   var gridHeight = tabPanelHeight - panelHeight - 31;
}
if (panelNameOne != '0' && panelNameTwo != '0' && panelThree != '0') {
  //表明页面有四个panel，需要的到第四个panel的高度
   var tabPanelHeight = Ext.getCmp('MainTabPanel').getSize().height;
   var panel1Height = panelNameOne.getSize().height;
   var panel2Height = panelNameTwo.getSize().height;
   var panel3Height = panelThree.getSize().height;
   var gridHeight = tabPanelHeight - panel1Height - panel2Height - panel3Height - 31;
}
if (panelNameTwo == '0' && panelThree == '0' && panelNameOne == '0') {
  //页面只有一个panel，需要得到第一个panel的高度
   var tabPanelHeight = Ext.getCmp('MainTabPanel').getSize().height;
   var gridHeight = tabPanelHeight - 31;
}
if(parseInt(gridHeight)<0){
   return 150;
}else{
   return gridHeight;
}


//自动适应宽的写法
//bodyStyle : 'width:99.8%'
//autoWidth : true
}