<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
html {
height: auto;
overflow: scroll;
}
body {
display: flex;
flex-direction: row;
justify-content: space-between;
padding-top: 4rem;
}
div {
width: 48%;
overflow: hidden;
}
</style>
<script src="./plugins/lodash4.17.21/lodash.min.js"></script>
<script>
// 一些频繁触发的事件，我们不想让它频繁执行，比如 keyup scroll resize mousemove
// 防抖：动作执行停止后间隔一定的时间执行，应用场景： 搜索框联想
// 节流：不管执行的频率有多高，需要间隔一定的时间执行一次，应用场景：向下滚动加载数据
// 防抖和节流的区别：防抖：不管动作多少次，只有最后一次执行；节流：一段时间内执行多次，但人为地降低了执行的频率
let i_left = 0;
let i_right = 0;
document.addEventListener("DOMContentLoaded", () => {
document.getElementById("input-text-left").addEventListener("keyup", () => {
i_left++;
console.log("left第" + i_left + "次");
});
document.getElementById("input-text-right").addEventListener(
"keyup",
_.debounce(function () {
i_right++;
console.log("right第" + i_right + "次");
}, 800)
);
leftBoxEl = document.getElementById("left-box");
rightBoxEl = document.getElementById("right-box");
document.addEventListener("scroll", () => {
imgEl = document.createElement("img");
imgEl.src = "./images/1.jpg";
leftBoxEl.appendChild(imgEl);
console.log("left共" + leftBoxEl.querySelectorAll("img").length);
});
document.addEventListener(
"scroll",
_.throttle(() => {
imgEl = document.createElement("img");
imgEl.src = "./images/1.jpg";
document.getElementById("right-box").appendChild(imgEl);
console.log("right共" + rightBoxEl.querySelectorAll("img").length);
}, 1000)
);
});
</script>
</head>
<body>
<div id="left-box">
<input type="text" id="input-text-left" />
<img src="./images/1.jpg" />
</div>
<div id="right-box">
<input type="text" id="input-text-right" />
<img src="./images/1.jpg" />
</div>
</body>
</html>
标签：防抖,right,lodash,getElementById,imgEl,document,节流,left From： https://www.cnblogs.com/caroline2016/p/16962502.html