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我正在使用jquery,我想从javascript设置选定的值

使用Javascript/jQuery的

$(document).ready(function() {
  var selectedUserRole = document.getElementById('SelectedUserRole').value;
  var str_array = selectedUserRole.split(',');

  for (var i = 0; i < str_array.length; i++) {
    // Trim the excess whitespace.
    str_array[i] = str_array[i].replace(/^\s*/, "").replace(/\s*$/, "");
    // Add additional code here, such as:

    $("UserRole").prop('selectedValue', str_array[i]); // Here not working
  }
});

HTML:

 @Html.DropDownList("UserRole", null, new { id = "UserRole", @class = "chosen-select", @multiple = "multiple", @placeholder = "Lütfen Rol Seçiniz", @style = "width: 250px;" })

str_array的值如下

[5,1,7]

我想设置5个值,选择1个值,选择7个值

当我尝试下面

$("UserRole").prop('selectedValue', str_array[i]);

它不适合我.