XMLHttpRequest()有错误吗？为什么显示ReferenceError: xmlhttprequest is not defined啊？

Question

```javascript
var url ="http://api.lfemcp.com/token/get";
//var XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest;
var xhr =new XMLHttpRequest();
xhr.open('POST',url,true);
xhr.setRequestHeader("Content-type","application/x-wwww-form-urlencoded");
var obj ='appKey=2045486032334ec287e4698f11b9cd60&appSecret=2b363714a46a42a6aef660797a5f20ef&account=SDULIMS';
xhr.send(obj);
xhr.onreadystatechange = function(){
    if(xhr.readyState == 4 && xhr.status == 200) {
        var res=xhr.responseText;
        console.log(res);
    }
}

```

Answer 1

没问题呢你的代码，不会用的IE6吧？IE6需要用activexobject来创建，不支持XMLHttpRequest。有帮助麻烦点个采纳【本回答右上角】，谢谢~~有其他问题可以继续交流~

xhr.setRequestHeader("Content-type", "application/x-wwww-form-urlencoded");

==》这里多了个w，所以没有发送键值对，接口无法正常获取数据，去掉就可以正常请求了

xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");