解析Javascript中的多级JSON字符串

Question

I want to parse the following JSON string in Javascript:

str = {
    "weather":[{
        "id":803,
        "main":"Clouds",
        "description":"broken clouds",
        "icon":"04d"
    }],
    "cod":200
}

I normally parse JSON strings like this:

var obj = JSON.parse(str);
alert(obj.weather.description);

But in this case it doesn't work for me. How do I have parse such JSON strings?

Answer 1

You just need to use

alert(str.weather[0].description);

1. As str is already an object, you don't need to parse() it again, this will result in an error.
2. Since weather is an array, You need to use index to access array's element.

Answer 2

您需要创建一个像这样的数组：

alert(str.weather[0].description);