jquery阻止默认submit，改用异步提交

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$(document).ready(function () {//wire up to the form submit event$("form.hijax").submit(function (event) {event.preventDefault();  //prevent the actual form posthijack(this, update_sessions, "html");});});function hijack(form, callback, format) {$("#indicator").show();$.ajax({url: form.action,type: form.method,dataType: format,data: $(form).serialize(),completed: $("#indicator").hide(),success: callback});}