透過JS跨網域存取XML檔
為了一些安全性的因素，通常伺服器會阻擋跨網域的XML存取，當然如果你是該網站開發者，所開發的頁面應該將會被放在被認可的網域中，不會碰到這個問題，但我們在開發前期有可能會不在所屬的網域，這樣就會造成開發上的困難，不過我們可以透過Yahoo所提供的YQL查詢語法來解決這個問題，以下就是相關的說明：
若我們在自己的電腦用以下的語法去存取一個網路上的XML
<script>
$(function () {
var xmlSource = "http://stanley.cloudlab.tw/crossDomainXML/testXML.xml";
$.ajax({
url: xmlSource,
success: function (data) {
console.log(data);
}
})
})
</script>
很可能會出現「No Access Control Allow Origin」的訊息：
但如果套用上YQL之後
<script>
$(function(){
var xmlSource = "http://stanley.cloudlab.tw/crossDomainXML/testXML.xml";
var yqlURL = [
"http://query.yahooapis.com/v1/public/yql",
"?q=" + encodeURIComponent("select * from xml where url='" + xmlSource + "'"),
"&format=xml&callback=?"
].join("");
$.getJSON(yqlURL, function(data){
console.log(data)
});
})
</script>
可以看到已經可以抓到XML內容，這樣可以讓我們較為方便的去開發，其他詳細的使用說明可以參考Yahoo YQL Guide。
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