前言

在系统应用中，像图片，流程预览及打印预览等情况，当前视窗无法全部显示要预览的全部内容，设置左右和上下滚动条后，如果用鼠标拖动滚动条，又不太便利，如何用鼠标随意的移动呢？

核心方法及事件

可以借助mousedown，mouseup，mousemove三个事件来处理内容的移动与起始、结束的控制，再借助getComputedStyle动态设置移动内容的left,top，以实现区域的随意移动。

简单代码示例

<template><div><div style="display: flex; justify-content: center"><div class="main"></div></div></div>
</template>
<script lang="ts" setup>
import { ref, reactive, onMounted } from 'vue'
onMounted(() => {moveNode()
})
function moveNode() {const child = document.querySelector('.main')let isDragging = falselet prevX = 0let prevY = 0child.addEventListener('mousedown', function (e) {isDragging = trueprevX = e.clientXprevY = e.clientY})child.addEventListener('mouseup', function () {isDragging = false})child.addEventListener('mousemove', function (e) {if (isDragging) {const diffX = e.clientX - prevXconst left = parseInt(window.getComputedStyle(child).left) || 0child.style.left = `${left + diffX}px`prevX = e.clientXconst diffY = e.clientY - prevYconst top = parseInt(window.getComputedStyle(child).top) || 0child.style.top = `${top + diffY}px`prevY = e.clientY}})
}
</script>
<style lang="less" scoped>
.main {position: relative;left: 0;top: 0;right: 0;bottom: 0;height: 500px;width: 500px;background-color: red;cursor: move;
}
</style>

动态演示