我遇到了 javascript 代碼的問題。我正在嘗試動態圖表，它將在使用 plotly.reshape 函數更改選擇字段時更新。我在 chart() 函數中調用基于 Ajax 請求的函數，我希望它等待變量分配，然后繪制圖表。我想我在錯誤的地方使用了 async/await。你們能幫幫我嗎？這是我的第一個 js 腳本，但我在項目中需要它。function chart(){  var x = Chart();  var X =x[0];  var Close=x[1];  var High=x[2];  var Low=x[3];  var Open=x[4];  console.log(X);  var trace1 = {    x: X,     close: Close,     decreasing: {line: {color: '#7F7F7F'}},     high: High,    increasing: {line: {color: '#17BECF'}},     line: {color: 'rgba(31,119,180,1)'},     low:  Low,     open: Open,     type: 'ohlc',     xaxis: 'x',     yaxis: 'y'  };  var data = [trace1];  var layout = {    ...  };    Plotly.newPlot('chart', data, layout);  } function Chart(){  var data, date = [], price = [], open=[], Timestamp=[], High=[], Low = [];  let selectedItem = document.getElementById('currency-selector').value;  var url = `http://127.0.0.1:8000/${selectedItem}/`;   var x = new Array()  var requestURL = url; //URL of the JSON data  var request = new XMLHttpRequest({mozSystem: true}); // create http request    request.onreadystatechange = async function() {   if(request.readyState == 4 && request.status == 200) {            data = JSON.parse(request.responseText);            for (var i=0; i<data.length;i++) {          date.push(data[i].date)          price.push(data[i].close);          High.push(data[i].high);          open.push(data[i].Open);          Low.push(data[i].low);                }            //chart(date,price,High,Low,open);       }    await request.open('GET', requestURL, true);  request.send(); // send the request  }  return [date,price,High,Low,open];  }