1.
$("iframe:first", top._dialogs[top._dialogs.length - 2].panel).get(0).contentWindow.window.frames[0].document.getElementById("MainContent_Search").click();
或者
function Search() {
// debugger;
$('iframe:first', top._dialogs[top._dialogs.length - 2].panel).get(0).contentWindow.window.document.getElementById('MainContent_btnSearch').click();
}