alert('测试');

document.addEventListener("DOMContentLoaded", function () {
    const alert_button = document.getElementById("alert_button");
    alert_button.addEventListener("click", function () {
        alert("你还真按啊");
    });

    const close_button = document.getElementById("close_button");
    close_button.addEventListener("click", function () {
        window.close();
    });

    const open_button = document.getElementById("open_button");
    open_button.addEventListener("click", function () {
        window.open();
    });
});

var num1 = 1;
var num2 = 2;
console.log(num1 + num2);