ext gridpanel添加列和响应函数
ext gridpanel添加列和响应函数：

{          header : 'extraColumn',       dataIndex : ' ',       width : 100,       renderer: function (value, meta, record) {  var formatStr += "<a href='javascript:void({0});' onclick='javscript:return false;'>增加</a>";  var resultStr = String.format(formatStr, record.get('id'));       return "<div class='controlBtn'>" + resultStr + "</div>";       }     },