php - 执行javascript代码时出现错误

Question

我将数据库列更改为不可为空，并且无法找到。但是，仍然没有收到任何值。这是控制台错误：4abdikani.local.ask.org/json.php:1 Failed to load resource: net::ERR_NAME_NOT_RESOLVED 4graphs.html:153 GET abdikani.local.ask.org/json.php net::ERR_NAME_NOT_RESOLVED – 此类错误的解决方案是什么。问题的代码答案如何将 json 文件转换为图形？返回此错误

这是代码的主要部分。我希望它从本地 php 页面返回值并将其显示在图表上。

function getData() {
            var xhttp = new XMLHttpRequest();
            xhttp.onreadystatechange = function() {
                if (this.readyState == 4 && this.status == 200) {
                    //Push the data in array
                    var time = new Date().toLocaleTimeString();
                    var txt = this.responseText;
                    var obj = JSON.parse(txt); //Ref: https://www.w3schools.com/js/js_json_parse.asp
                    console.log(obj);
                    obj.forEach(function(element_data){
                        console.log(element_data);
                        ADCvalues.push(element_data.waterlevel);
                        Tvalues.push(element_data.temperature);
                        Hvalues.push(element_data.humidity);
                        timeStamp.push(time);
                        showGraph();
                        var table = document.getElementById("dataTable");
                        var row = table.insertRow(1); //Add after headings
                        var cell1 = row.insertCell(0);
                        var cell2 = row.insertCell(1);
                        var cell3 = row.insertCell(2);
                        var cell4 = row.insertCell(3);
                        cell1.innerHTML = time;
                        cell2.innerHTML = element_data.waterlevel;
                        cell3.innerHTML = element_data.temperature;
                        cell4.innerHTML = element_data.humidity;
                    });
                }
            };
            xhttp.open("GET", "http://abdikani.local.ask.org/json.php", true); // Works fine with me using the same json document locally - Handle readADC server on ESP8266
            xhttp.send();
        }
        </script>
    </body>
</html>

标签： phpjson