重新调用IIFE

Question

为什么该代码块会引发错误“未捕获的ReferenceError：未定义setSize”

const canvas = document.querySelector("#draw");

(function setSize() {
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
})();

window.addEventListener("resize", () => {
    setSize();
})

Answer 1

只需定义您的setSize函数并调用一次即可（它的作用与IFFE相同）。

const canvas = document.querySelector("#draw");

function setSize() {
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
}

setSize();

window.addEventListener("resize", () => {
    setSize();
})