我正在使用 JSON 请求来检索我正在开发的网页中的一些流计量信息。为了兼容 IE,我使用的是 XDomainRequest。XDR 在第一次加载页面期间成功检索数据,但后续调用(加载后在页面上使用 windows.setInterval)不返回更新信息。清除浏览器缓存也无济于事。页面加载新数据的唯一方法是实际重新启动 IE 并加载页面。我错过了什么??
这是我的 XDR 代码:
//Now Access & Process the NWS Gage Data
if ($.browser.msie && window.XDomainRequest) {
//Internet Explorer Doesn't support JQuery's getJSON so you must use an alternative method
// Use Microsoft XDR
var xdr = new XDomainRequest();
xdr.open("get", "http://waterservices.usgs.gov/nwis/iv/?format=json&sites=12150800,12167000,12161000,12150400,12138160,12134500,12186000,12155300,12155500¶meterCd=00065");
xdr.onload = function () {
//parse response as JSON
var JSON = $.parseJSON(xdr.responseText);
if (JSON == null || typeof (JSON) == 'undefined')
{
JSON = $.parseJSON(data.firstChild.textContent);
}
array.forEach(JSON.value.timeSeries, function(curGage, i){
curGageID = curGage.sourceInfo.siteCode[0].value;
curGageName = curGage.sourceInfo.siteName;
curGageHeight = curGage.values[0].value[0].value;
curGageObs = curGage.values[0].value[0].dateTime;
//Another Internet Explorer quirk. Date format must be changed due to IE's different interpretation
curGageObs = curGageObs.replace(/\-/g,"/");
curGageObs = curGageObs.replace(/T/g," ");
curGageObs = curGageObs.substring(0,curGageObs.length-10);
var theDate = new Date(curGageObs);
document.getElementById('u' + curGageID + 'Height').innerHTML = curGageHeight + " Feet";
document.getElementById('u' + curGageID + 'Date').innerHTML = theDate.toString('M/d/yyyy @ h:mm tt');
assignNwsStageColor(curGageID, curGageHeight);
});
};
xdr.send();
} else {
$.getJSON("http://waterservices.usgs.gov/nwis/iv/?format=json&sites=12150800,12167000,12161000,12150400,12138160,12134500,12186000,12155300,12155500¶meterCd=00065", function(data) {
array.forEach(data.value.timeSeries, function(curGage, i){
curGageID = curGage.sourceInfo.siteCode[0].value;
curGageName = curGage.sourceInfo.siteName;
curGageHeight = curGage.values[0].value[0].value;
curGageObs = curGage.values[0].value[0].dateTime;
var theDate = new Date(curGageObs);
document.getElementById('u' + curGageID + 'Height').innerHTML = curGageHeight + " Feet";
document.getElementById('u' + curGageID + 'Date').innerHTML = theDate.toString('M/d/yyyy @ h:mm tt');
assignNwsStageColor(curGageID, curGageHeight);
});
});
}
谢谢!史蒂夫