jquery EasyUI的formatter格式化函数代码_jquery

$('#tt').datagrid({
title:'Formatting Columns',
width:550,
height:250,
url:'datagrid_data.json',
columns:[[
{field:'itemid',title:'Item ID',width:80},
{field:'productid',title:'Product ID',width:80},
{field:'listprice',title:'List Price',width:80,align:'right',
formatter:function(val,rec){
if (val return '('+val+')';
} else {
return val;
}
}
},
{field:'unitcost',title:'Unit Cost',width:80,align:'right'},
{field:'attr1',title:'Attribute',width:100},
{field:'status',title:'Status',width:60}
]]
});

var num=2.4445;
var number=val.toFixed(2);//格式化,保留两位小数
alert(number);