<html><body><p>如何修改 JSON 对象的数组值。</p><p id="demo"></p><script>var myObj, i, x = "";myObj = { "name":"John", "age":30, "cars":[ "Ford", "BMW", "Fiat" ]};myObj.cars[1] = "Mercedes";for (i in myObj.cars) { x += myObj.cars[i] + "<br>";}document.getElementById("demo").innerHTML = x;</script></body></html>