关于javascript：XMLHttpRequest无法加载 – 请求的资源上没有“Access-Control-Allow-Origin”标头

XMLHttpRequest cannot load - No 'Access-Control-Allow-Origin' header is present on the requested resource

本问题已经有最佳答案，请猛点这里访问。

ERROR XMLHttpRequest无法加载 - 请求的资源上不存在"Access-Control-Allow-Origin"标头。

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//XMLHttpRequest

var xhr = new XMLHttpRequest();
if (!('withCredentials' in xhr)) {
alert('Browser does not support CORS.');
return;
}
xhr.onerror = function() {
alert('There was an error.');
};
xhr.onload = function() {"done"}
xhr.open("GET","http://indicadoreseconomicos.bccr.fi.cr/indicadoreseconomicos/WebServices/wsIndicadoresEconomicos.asmx/ObtenerIndicadoresEconomicos?tcIndicador=318&tcFechaInicio=01/03/2014&tcFechaFinal=01/01/2016&tcNombre=A&tnSubNiveles=N",true);
xhr.send(null);
console.log("loading >>>")

</head>
<body>
</body>
</html>