从 XHR 获取响应 Content-Type 标头

Get the response Content-Type header from XHR(从 XHR 获取响应 Content-Type 标头)

问题描述

我想看看标题是 text/html 还是 text/xml.如果它是 text/html 则有一个错误，我宁愿在继续之前抓住它.

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.

推荐答案

使用 getResponseHeader() 方法.

小例子:

<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>

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