如何修复“Unable to get property 'get‘of undefined or null reference”

let obj = { get: function() { return "value"; } };
console.log(obj.get); // 正常工作

let obj = someFunctionThatMightReturnNull();
if (obj) {
    console.log(obj.get);
} else {
    console.log("Object is null or undefined");
}

let obj = someFunctionThatMightReturnNull();
console.log(obj?.get); // 如果obj是null或undefined，这里不会抛出错误

async function fetchData() {
    let response = await fetch('https://api.example.com/data');
    let data = await response.json();
    if (data) {
        console.log(data.get);
    } else {
        console.log("Data is null or undefined");
    }
}

let element = document.getElementById('myElement');
if (element) {
    console.log(element.getAttribute('data-get'));
} else {
    console.log("Element not found");
}

function getUser() {
    // 模拟可能返回null的情况
    return Math.random() > 0.5 ? { name: "John", getAge: function() { return 30; } } : null;
}

let user = getUser();
if (user) {
    console.log(user.getAge()); // 正常工作
} else {
    console.log("User not found");
}