你可以使用索引值來修改數組值：
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myObj.sites[1] = "Github";
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JS中文教程網 8939.org</title>
</head>
<body>
<p>修改 JSON 對象數組值。</p>
<p id="demo"></p>
<script>
var myObj, i, x = "";
myObj = {
"name":"網站",
"num":3,
"sites":[ "Google", "Runoob", "Taobao" ]
};
myObj.sites[1] = "Github";
//delete myObj.sites[1];
for (i in myObj.sites) {
x += myObj.sites[i] + "<br>";
}
document.getElementById("demo").innerHTML = x;
</script>
</body>
</html>
![Json.Net系列教程 2.Net類型與JSON的映射關系[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)