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index.html
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index.html
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<!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,
body {
width: 100%;
height: 100%;
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.box {
width: 300px;
height: 100%;
background-color: darkgray;
overflow: hidden;
}
</style>
</head>
<body>
<div class="box" id="box"></div>
</body>
</html>
<script>
/**
* 调整左侧div宽度
* 接收需要调整的dom对象
* */
function boxResize(dom) {
var div = document.createElement("div");
let divSty = div.style;
divSty.width = "5px";
divSty.height = "100%";
divSty.position = "absolute";
divSty.top = "0";
divSty.right = "0";
divSty.cursor = "e-resize";
dom.appendChild(div);
dom.style.position = "relative";
//鼠标按下事件
div.onmousedown = (e) => {
let w = dom.offsetWidth; //获取 div 元素的宽度，包含内边距（padding）和边框（border）
let startX = e.clientX; //鼠标指针的水平坐标
// 鼠标拖动事件
document.onmousemove = function (e) {
let change = e.clientX - startX; //鼠标移动的偏移值
let moveLen = w + change; //鼠标移动后，分割线节点元素的左边界的偏移值
if(moveLen >= 100) {
dom.style.width = moveLen + "px";
}
};
// 鼠标松开事件
document.onmouseup = function (evt) {
evt.stopPropagation();
document.onmousemove = null;
document.onmouseup = null;
//当你不在需要继续获得鼠标消息就要应该调用ReleaseCapture()释放掉
div.releaseCapture && div.releaseCapture();
};
div.setCapture && div.setCapture();
};
}
window.onload = () => {
//获取要调整元素的dom
let box = document.getElementById("box");
//调用方法,传入dom对象
boxResize(box);
};
</script>