<body>
<p id="demo"></p>
<script>
var txt = '{"coord":{"lon":108.27,"lat":-7.68},"weather":[{"id":500,"main":"Rain","description":"light rain","icon":"10d"}],"base":"stations","main":{"temp":26.97,"pressure":1010.86,"humidity":100,"temp_min":26.97,"temp_max":26.97,"sea_level":1021.57,"grnd_level":1010.86},"wind":{"speed":1.61,"deg":232.009},"rain":{"3h":1.88},"clouds":{"all":56},"dt":1474443506,"sys":{"message":0.1676,"country":"ID","sunrise":1474411011,"sunset":1474454577},"id":8044852,"name":"Bojongsari","cod":200}';
var obj = eval ("(" + txt + ")");
document.getElementById("demo").innerHTML =
obj.rain.3h
</script>
</body>
为什么 obj.rain.3h 没有显示，而另一个成功如obj.clouds.all