我正在尝试从 JSONata 表达式获取结果以使用 HTML 和 Javascript 打印出来，但我没有任何运气。 该表达式在 JSONata Playground 中工作并生成我期望的数组，但当我将其包含在 JavaScript 函数中时，我没有得到任何输出。
这是我写的表达式：
items.{"Release Year":$number(($toMillis($.track.album.release_date))~>$fromMillis('[Y]')),"Track":track.name,"Artist(s)":$join($map(track.artists.name,$string),", "),"Album":track.album.name,"Genre":"","URL":$join(['https://song.link/s/',track.id]),"Release Date":track.album.release_date,"Duration":track.duration_ms,"Popularity":track.popularity,"SpotifyID":track.id,"Added to Playlist On":$toMillis($.added_at)~>$fromMillis('[M]/[D]/[Y] at [h]:[m] [P]')}
此表达式用于以下 HTML 中。由于这是 iOS 快捷方式，因此变量 apiResponse2 是通过一系列不同的命令填充的。我知道我从 API 得到了适当的响应：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script src="https://cdn.jsdelivr.net/npm/jsonata/jsonata.min.js"></script>
</head>
<body>
<script>
var jsonata = require("jsonata");
function evaluateJsonata() {
var apiData = apiResponse2;
var expression = jsonata(items.{"Release Year":$number(($toMillis($.track.album.release_date))~>$fromMillis('[Y]')),"Track":track.name,"Artist(s)":$join($map(track.artists.name,$string),", "),"Album":track.album.name,"Genre":"","URL":$join(['https://song.link/s/',track.id]),"Release Date":track.album.release_date,"Duration":track.duration_ms,"Popularity":track.popularity,"SpotifyID":track.id,"Added to Playlist On":$toMillis($.added_at)~>$fromMillis('[M]/[D]/[Y] at [h]:[m] [P]')});
var result = expression.evaluate(apiData);
document.write(JSON.stringify(result))
}
</script>
</body>
</html>
您可以在此链接查看 Spotify API 返回的 JSON 示例。 API JSON 也在 JSONata 游乐场。
因为这是一个 iOS 快捷方式，所以我将以上内容发布在文本块中，然后执行以下操作：
但是，我没有得到预期的数组。事实上，我什么也得不到。我希望我的错误与 Javascript 有关。
任何调试此问题的帮助将不胜感激。
尝试使您的函数异步并等待评估方法，如下所示：
async function evaluateJsonata() {
var apiData = apiResponse2;
var expression = jsonata(items.{"Release Year":$number(($toMillis($.track.album.release_date))~>$fromMillis('[Y]')),"Track":track.name,"Artist(s)":$join($map(track.artists.name,$string),", "),"Album":track.album.name,"Genre":"","URL":$join(['https://song.link/s/',track.id]),"Release Date":track.album.release_date,"Duration":track.duration_ms,"Popularity":track.popularity,"SpotifyID":track.id,"Added to Playlist On":$toMillis($.added_at)~>$fromMillis('[M]/[D]/[Y] at [h]:[m] [P]')});
var result = await expression.evaluate(apiData);
document.write(JSON.stringify(result))
}