Javascript uu doPostBack在Safari中不起作用

我在javascript部分中使用_udopostback在单击过滤器按钮时过滤数据

它适用于chrome和IE，但不适用于Safari。更重要的是，它在ipad中不起作用

safari的版本是5.1.7

我该怎么办

在javascript部分：

var wbePartClientID = "IdOfDiscussionListWebPart";
var filterparameter = 'filterparams';
__doPostBack(wbePartClientID ,filterparameter );  

if (Page.IsPostBack) 

//safari --> always false
//chrome--> When page load first it is false (normally) and when I click filter button it is "true"

在代码隐藏中：

var wbePartClientID = "IdOfDiscussionListWebPart";
var filterparameter = 'filterparams';
__doPostBack(wbePartClientID ,filterparameter );  

if (Page.IsPostBack) 

//safari --> always false
//chrome--> When page load first it is false (normally) and when I click filter button it is "true"