在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(cainiaoplay.com)</title>
</head>
<body>

<p>使用中括号([])来修改 JSON 对象的值。</p>

<p id="demo"></p>

<script>
var myObj, i, x = "";
myObj = {
    "name":"cainiaoplay",
    "alexa":10000,
    "sites": {
        "site1":"www.cainiaoplay.com",
        "site2":"m.cainiaoplay.com",
        "site3":"c.cainiaoplay.com"
    }
}
myObj.sites["site1"] = "www.google.com";

for (i in myObj.sites) {
    x += myObj.sites[i] + "<br>";
}

document.getElementById("demo").innerHTML = x;

</script>

</body>
</html>
源代码

动行结果
