Chrome浏览器设置间隔警报声明

Question

我有以下代码来检查会话。每15秒调用一次checksession。

此代码在IE浏览器中运行良好，但在Chrome中，警告语句从不会弹出，并且会直接重定向到给定的网址...

setInterval(checksession, 15000)

function checksession() {
    alert('check session')
    $.ajax({
        aynsc: false,
        type: 'POST',
        url: 'CheckSession',
        success: validateresult,
        data: {
            antiCSRF: '{{acsrf}}',
            session_id: '{{session_id}}'
        },
        error: function () {
            alert('Session check failed')
        }
    })
    return false;
}

function validateresult(result) {
    if (result == "N") {
        valid_flag = "N"
        alert("Your session has been timed-out based upon Security Policy. Please click OK to be redirected to the login page to start a new session.");
        window.location.assign('./')
    } else {
        valid_flag = "Y";
        return valid_flag
    }
}