//<![CDATA[
Sys.Application.add_init(function() {
    $create(Sys.Extended.UI.ComboBox, {"autoCompleteMode":0,"autoPostBack":true,"buttonControl":$get("ddlDongYiPiCiMingCheng_Button"),"comboTableControl":$get("ddlDongYiPiCiMingCheng_Table"),"dropDownStyle":1,"hiddenFieldControl":$get("ddlDongYiPiCiMingCheng_HiddenField"),"optionListControl":$get("ddlDongYiPiCiMingCheng_OptionList"),"selectedIndex":1,"textBoxControl":$get("ddlDongYiPiCiMingCheng_TextBox")}, null, null, $get("ddlDongYiPiCiMingCheng"));
});

//]]>

这个问题不大好描述。。。。

用后台去调用前台JS的时候触发的这个错误，好奇怪。