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<!DOCTYPE html>
<html>
<body>
​
<h1>JSON 对象</h1>
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<p>如何使用括号表示法修改 JSON 对象中的值。</p>
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<p id="demo"></p>
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<script>
var myObj, i, x = "";
myObj = {
  "name":"Bill Gates",
  "age":62,
  "cars": {
  "car1":"Porsche",
  "car2":"BMW",
  "car3":"Volvo"
  }
}
myObj.cars["car2"] = "Mercedes Benz";
​
for (i in myObj.cars) {
  x += myObj.cars[i] + "<br>";
}
​
document.getElementById("demo").innerHTML = x;
</script>
​
</body>
</html>
​