Ext Grid 添加 tip 提示信息

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1.
{header:"姓名",dataIndex:"actor",sortable:true,width:80,renderer:showTip},
2.
function showTip(data, metadata, record, rowIndex, columnIndex, store){
//moviesColumn 如果为null，可以通过record获取title值
var title=moviesColumn.getColumnHeader(columnIndex);
metadata.attr = 'ext:qtitle="'+title+'" ext:qtip="' + data + '"';
//metadata.attr = 'ext:qtip="' + data + '"';
//return "<div ext:qtip='<img src=\""+value+"\" width=100 hight=100/>'>"+value+"</div>";
return data;
}