Javascript 从 XHR 获取响应 Content-Type 标头
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时间：2020-08-23 14:41:47 来源:igfitidea点击:
Get the response Content-Type header from XHR
提问by Bryan Field
I would like to see whether the header was text/html or text/xml. If it was text/html then there was an error and I would rather catch that before proceeding.
我想看看标题是 text/html 还是 text/xml。如果它是 text/html 那么有一个错误，我宁愿在继续之前抓住它。
回答by Quentin
Use the getResponseHeader()method.
使用getResponseHeader()方法。
Minimal example:
最小的例子：
<script>
function hand () {
console.log(this.getResponseHeader('content-type'));
}
var x = new XMLHttpRequest();
x.onreadystatechange = hand;
x.open('GET', 'index.html', true);
x.send();
</script>
