extjs 表格中加按钮

   效果

varlook;//表格中按钮的函数声明（应放在Ext.onReady语句外）
Ext.onReady(function(){
var storeUserLv = new Ext.data.SimpleStore({
　　proxy : new Ext.data.HttpProxy({url:'xml_grid_json.php?mode=userlv'}),
　　fields : [
　　{name : 'id',mapping : 'id'},
　　{name : 'lv',mapping : 'lv'},
　　{name : 'money',mapping : 'money'},
　　{name : 'needExp',mapping : 'needExp'},
　　{name : 'grade',mapping : 'grade'},
　　{name : 'friendCount',mapping : 'friendCount'}, 
　　{name : 'friendLv',mapping : 'friendLv'},
　　{name : 'maxCommit',mapping : 'maxCommit'},
　　{name : 'maxHeroCount',mapping : 'maxHeroCount'}
　　]
});


var gridUserLv = new Ext.grid.EditorGridPanel({
    renderTo: "tab1",//这里指定渲染到层的id
    height:590,
    autoWidth:true,
    columns:[{
         　　 header: "id",dataIndex: "id",width: 100
          }, {
          　　header: "lv",dataIndex: "lv",width: 100
          }, {
          　　header: "money",dataIndex: "money",width: 100
          }, {
         　　 header: "needExp",dataIndex: "needExp",width: 100
          }, {
          　　header: "grade",dataIndex: "grade",width: 100
          }, {
         　　 header: "friendCount",dataIndex: "friendCount",width: 100
          }, {
          　　header: "friendLv",dataIndex: "friendLv",width: 100
          }, {
          　　header: "maxCommit",dataIndex: "maxCommit",width: 100
          }, {
              header: "maxHeroCount",dataIndex: "maxHeroCount",editor:new Ext.form.TextField(),width: 100
          },{ 
　　　　　　　　header: "操作", dataIndex: 'Gender', 
              renderer: function() {                      //此处为主要代码
              var str = "<input type='button' value='查看' onclick='look()'>";
              return str;
          }
      }],
      loadMask: true,
      ds: storeUserLv,
      sm: new Ext.grid.RowSelectionModel({singleSelect:true}),
      clicksToEdit: 2,
      });  
//处理函数可在此处定义  
look = function(){
    var sm = gridUserLv.getSelectionModel();
    var sel = sm.getSelected();
    alert(sel.get('id'));
  }