var queryParams = $('#SBDiv_1_DateGrid').datagrid('options').queryParams;
queryParams.SearchTime = ""; //设置值
$('#SBDiv_1_DateGrid').datagrid('options').queryParams = queryParams;
$("#SBDiv_1_DateGrid").datagrid('reload');
var queryParams = $('#SBDiv_1_DateGrid').datagrid('options').queryParams;
queryParams.SearchTime = ""; //设置值
$('#SBDiv_1_DateGrid').datagrid('options').queryParams = queryParams;
$("#SBDiv_1_DateGrid").datagrid('reload');