Javascript 无法使用XMLHttpRequest从rest api获取响应
我想使用XMLHttpRequest调用get-rest api,但遇到错误- “未捕获的语法错误:JSON输入意外结束” RESTAPI json响应数据Javascript 无法使用XMLHttpRequest从rest api获取响应,javascript,Javascript,我想使用XMLHttpRequest调用get-rest api,但遇到错误- “未捕获的语法错误:JSON输入意外结束” RESTAPI json响应数据 { "timestamp": "2018-06-08T16:52:50.509Z", "dataFrame": "AQAAKCoAAQgFKgABBg==", "fcnt": 825, "freq": 865572000, "port": 2, "rssi": -115, "snr":
{
"timestamp": "2018-06-08T16:52:50.509Z",
"dataFrame": "AQAAKCoAAQgFKgABBg==",
"fcnt": 825,
"freq": 865572000,
"port": 2,
"rssi": -115,
"snr": -16,
"sf_used": 12,
"id": 1528476770509,
"dr_used": "SF12BW125",
"decrypted": true
}
代码
函数UserAction(){
var xhttp=newXMLHttpRequest();
xhttp.open(“GET”,“url”,true);
setRequestHeader(“内容类型”、“应用程序/json”);
setRequestHeader(“授权”,“基本a2Vyb==”);
xhttp.send();
var response=JSON.parse(xhttp.responseText);
}
编辑: 代码
函数userAction(){
设xhttp=newXMLHttpRequest();
xhttp.onreadystatechange=函数(){
if(this.readyState==4&&this.status==200){
让response=JSON.parse(xhttp.responseText);
var dataFrame=response.dataFrame;
/**处理响应的代码**/
}
};
xhttp.open(“GET”,“url”,true);
setRequestHeader(“内容类型”、“应用程序/json”);
setRequestHeader(“授权”,“基本a2VybmVsc==”);
xhttp.send();
HTML
搜索
您应该侦听请求的事件,以便仅在请求完成后解析结果:
functio userAction(){
设xhttp=newXMLHttpRequest();
xhttp.onreadystatechange=函数(){
if(this.readyState==4&&this.status==200){
让response=JSON.parse(xhttp.responseText);
document.getElementById(“数据”).innerHTML=response.dataFrame;
}
};
xhttp.open(“GET”,“filename”,true);
setRequestHeader(“内容类型”、“应用程序/json”);
setRequestHeader(“授权”,“基本a2Vyb==”);
xhttp.send();
}
您需要将xhttp.onreadystate属性设置为回调函数,以处理各种状态,然后在收到响应时处理响应
您应该在输出请求之前检查请求的状态
函数UserAction(){
var xhttp=newXMLHttpRequest();
xhttp.open(“GET”,“url”,true);
setRequestHeader(“内容类型”、“应用程序/json”);
setRequestHeader(“授权”,“基本a2Vyb==”);
xhttp.onload=函数(){
如果(xhttp.status==200){
var response=JSON.parse(xhttp.responseText);
}
}
xhttp.send();
}
getting error-Uncaught DomeException:未能在“XMLHttpRequest”上执行“setRequestHeader”:必须打开对象的状态。是的,我只是把顺序弄乱了一点,正在编辑。请告诉我它现在是否工作:)很好,请将问题标记为已回答:-)hai@Luca你能告诉我如何将dataFrame变量绑定到html H1标记吗?P可能的复制品
<script>
function UserAction() {
var xhttp = new XMLHttpRequest();
xhttp.open("GET", "url", true);
xhttp.setRequestHeader("Content-type", "application/json");
xhttp.setRequestHeader("Authorization", "Basic a2Vyb==");
xhttp.send();
var response = JSON.parse(xhttp.responseText);
}
</script>
<script>
function userAction() {
let xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
let response = JSON.parse(xhttp.responseText);
var dataFrame = response.dataFrame;
/** code that handles the response **/
}
};
xhttp.open("GET", "url", true);
xhttp.setRequestHeader("Content-type", "application/json");
xhttp.setRequestHeader("Authorization", "Basic a2VybmVsc==");
xhttp.send();
</script>
<button type="submit" onclick="userAction()">Search</button>
<h1 id="data"></h1>