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<!DOCTYPE html>
<html>
<body>
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<h1>JSON 数组</h1>
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<p>如何修改 JSON 对象的数组值。</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": ["Porsche","BMW","Volvo"]
}
myObj.cars[2] = "Mercedes Benz";
​
for (i in myObj.cars) {
  x += myObj.cars[i] + "<br>";
}
document.getElementById("demo").innerHTML = x;
</script>
​
</body>
</html>
​