您尝试的是在Vega-Lite中指定时域的正确方法，但是Vega-Lite 4.5中引入了此行为中的错误。这是使用Vega-Lite 4.4的规格结果：
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm//vega@5"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm//vega-lite@4.4"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm//vega-embed@6"></script>
</head>
<body>
<div id="vis"></div>
<script>
var spec = {
"$schema": "https://vega.github.io/schema/vega-lite/v4.json",
"data": {
"values": [
{"ts": 1500400000000, "v": 1},
{"ts": 1500500000000, "v": 2},
{"ts": 1500600000000, "v": 3},
{"ts": 1500700000000, "v": 2}
]
},
"width": 800,
"height": 300,
"mark": {"type": "line"},
"encoding": {
"x": {"field": "ts", "type": "temporal", "scale": {"domain": [1500000000000, 1500900000000]}},
"y": {"field": "v", "type": "quantitative", "scale": {"domain": [0, 5]}}
}
};
vegaEmbed("#vis", spec);
</script>
</body>
</html>
谢谢。这个问题也已经得到解决，太好了。