关闭页面时window.location事件未执行的原因分析及解决方案

window.onunload = function() {
    logout();
  }

function logout(reqParam, callback){
    var userManageServiceUrl = "http://" + getServerAddr() + "/axis2/services/UserManageService";
    var urlList = [];
    var url = window.location.href;
    urlList = url.split("");
    var sessionID = urlList[1];
    reqParam.sessionID = sessionID;
    var pl = new SOAPClientParameters();
    var reqParamStr = JSON.stringify(reqParam);
    pl.add("reqParam", reqParamStr);
    SOAPClient.invoke(userManageServiceUrl, "logout", pl, false, callback);
  }