document.getElementById("demo").innerHTML = x;
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3xue教程(w3xue.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":"W3xue",
"alexa":10000,
"sites": {
"site1":"www.w3xue.com",
"site2":"m.w3xue.com",
"site3":"c.w3xue.com"
}
myObj.sites["site1"] = "www.google.com";