JS 对象与数组互相嵌套的复杂例子

JS写法如下：

 const myObj = {
        name: "John",
        age: 30,
        cars: [
            { name: "Ford", models: ["Fiesta", "Focus", "Mustang"] },
            { name: "BMW", models: ["320", "X3", "X5"] },
            { name: "Fiat", models: ["500", "Panda"] }
        ]
    }

    //官方例子写法
    let x = "";
    for (let i in myObj.cars) {
        x += "<h1>" + myObj.cars[i].name + "</h1>";
        for (let j in myObj.cars[i].models) {
            x += myObj.cars[i].models[j] + "<br>";
        }
    }
    document.getElementById("demo").innerHTML = x;

    //存疑写法，如果只想models里的数值一次性输出，是不是可以少写一次循环？
    let y = "";
    for (let i in myObj.cars) {
        y += "<h1>" + myObj.cars[i].name + "</h1>";
        y += myObj.cars[i].models + "<br>";
    }
    
    document.getElementById("demo2").innerHTML = y;

1. 官方例子测试结果如下：

 2. 存疑例子测试如下：