vue// 获取按钮和div元素const button = document.querySelector('button');const div = document.querySelector('div');// 添加点击事件监听器button.addEventListener('click', () => { // 修改div元素的background-color属性为红色 div.style.backgroundColor = 'red';});这段代码写在<script>标签里的哪
时间: 2024-01-22 15:19:35 浏览: 26
这段代码可以写在`<script>`标签中,或者单独放在一个`.js`文件中引入到HTML文件中。需要注意的是,这段代码应该放在HTML文件中对应的按钮和div元素之后,否则获取不到这两个元素。例如:
```html
<button>点击我</button>
<div>我会变成红色</div>
<script>
const button = document.querySelector('button');
const div = document.querySelector('div');
button.addEventListener('click', () => {
div.style.backgroundColor = 'red';
});
</script>
```
相关问题
const handleScroll = (index: number,e:Event) => { const container = document.querySelector(".index_"+index) as HTMLElement const scrollWidth = container.scrollWidth; // 滚动宽度 const scrollLeft = container.scrollLeft; // 滚动条的左侧距离容器左侧的距离 const clientWidth = container.clientWidth; // 可见宽度 if(scrollLeft >= (scrollWidth - clientWidth ) || (scrollWidth - clientWidth ) < 5){ console.log('最右边了',index) jumpToDetailPage(index) } } 这个滚动条事件应该用节流还是防抖,怎么写,vue3+TS项目中
这个滚动条事件应该使用节流,因为在用户快速滚动时,防抖会导致事件被多次触发,增加了性能开销。
在Vue3+TS项目中,你可以使用lodash库中的throttle函数来实现节流。具体可以按照以下步骤进行:
1. 在项目中安装lodash库:`npm install lodash`
2. 引入throttle函数:`import { throttle } from 'lodash'`
3. 在组件中定义一个变量来保存节流后的函数:
```
const handleScrollThrottled = throttle((index: number,e:Event) => {
const container = document.querySelector(".index_"+index) as HTMLElement
const scrollWidth = container.scrollWidth; // 滚动宽度
const scrollLeft = container.scrollLeft; // 滚动条的左侧距离容器左侧的距离
const clientWidth = container.clientWidth; // 可见宽度
if(scrollLeft >= (scrollWidth - clientWidth ) || (scrollWidth - clientWidth ) < 5){
console.log('最右边了',index)
jumpToDetailPage(index)
}
}, 200)
```
这里的throttle函数会将原函数的执行间隔限制为200ms。
4. 在滚动条事件中调用throttled函数:
```
const handleScroll = (index: number,e:Event) => {
handleScrollThrottled(index, e)
}
```
这样就完成了滚动条事件的节流处理。
请根据代码片段仿写实现div左下角拖拽移动用具体代码实现,import Vue from 'vue' Vue.directive('dialogZoomOut', { bind(el, binding, vnode, oldVnode) { let minWidth = 400;let minHeight = 300;let isFullScreen = false; let nowWidth = 0;let nowHight = 0;let nowMarginTop = 0;const dialogHeaderEl = el.querySelector('.el-dialog__header');const dragDom = el.querySelector('.el-dialog');dragDom.style.overflow = "auto";dialogHeaderEl.onselectstart = new Function("return false");dialogHeaderEl.style.cursor = 'move';const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);let moveDown = (e) => {const disX = e.clientX - dialogHeaderEl.offsetLeft;const disY = e.clientY - dialogHeaderEl.offsetTop;let styL, styT;if (sty.left.includes('%')) {styL = +document.body.clientWidth * (+sty.left.replace(/%/g, '') / 100);styT = +document.body.clientHeight * (+sty.top.replace(/%/g, '') / 100);} else {styL = +sty.left.replace(/px/g, '');styT = +sty.top.replace(/px/g, '');};document.onmousemove = function (e) {const l = e.clientX - disX;const t = e.clientY - disY;dragDom.style.left = `${l + styL}px`;dragDom.style.top = `${t + styT}px`;};document.onmouseup = function (e) {document.onmousemove = null;document.onmouseup = null;};}dialogHeaderEl.onmousedown = moveDown;dialogHeaderEl.ondblclick = (e) => {if (isFullScreen == false) {nowHight = dragDom.clientHeight;nowWidth = dragDom.clientWidth;nowMarginTop = dragDom.style.marginTop;dragDom.style.left = 0;dragDom.style.top = 0;dragDom.style.height = "100VH";dragDom.style.width = "100VW";dragDom.style.marginTop = 0;isFullScreen = true;dialogHeaderEl.style.cursor = 'initial';dialogHeaderEl.onmousedown = null;} else {dragDom.style.height = "auto";dragDom.style.width = nowWidth + 'px';dragDom.style.marginTop = nowMarginTop;isFullScreen = false;dialogHeaderEl.style.cursor = 'move';dialogHeaderEl.onmousedown = moveDown;}}let resizeEl = document.createElement("div");dragDom.appendChild(resizeEl);resizeEl.style.cursor = 'se-resize';resizeEl.style.position = 'absolute';resizeEl.style.height = '10px';resizeEl.style.width = '10px';resizeEl.style.right = '0px';resizeEl.style.bottom = '0px';resizeEl.style.zIndex = '99';resizeEl.onmousedown = (e) => {let clientX = e.clientX;let disX = e.clientX - resizeEl.offsetLeft;let disY = e.clientY - resizeEl.offsetTop;document.onmousemove = function (e) {e.preventDefault(); let x = e.clientX - disX + (e.clientX - clientX);let y = e.clientY - disY;dragDom.style.width = x > minWidth ? `${x}px` : minWidth + 'px';dragDom.style.height = y > minHeight ? `${y}px` : minHeight + 'px';};document.onmouseup = function (e) {document.onmousemove = null;document.onmouseup = null;};}}})
以下是仿写的代码实现:
```html
<template>
<div class="dialog-wrapper" v-dialog-zoom-out>
<div class="el-dialog">
<div class="el-dialog__header">Dialog Title</div>
<div class="el-dialog__body">Dialog Content</div>
<div class="el-dialog__footer">
<button @click="$emit('close')">Close</button>
</div>
<div class="el-dialog__resize"></div>
</div>
</div>
</template>
<script>
export default {
name: "Dialog",
};
</script>
<style>
.dialog-wrapper {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
.el-dialog {
position: absolute;
top: 0;
left: 0;
overflow: auto;
max-height: 80vh;
background-color: #fff;
border-radius: 4px;
box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}
.el-dialog__header {
padding: 16px;
background-color: #f5f7fa;
border-top-left-radius: 4px;
border-top-right-radius: 4px;
cursor: move;
}
.el-dialog__body {
padding: 16px;
}
.el-dialog__footer {
display: flex;
justify-content: flex-end;
padding: 16px;
background-color: #f5f7fa;
border-bottom-left-radius: 4px;
border-bottom-right-radius: 4px;
}
.el-dialog__footer button {
padding: 8px 16px;
background-color: #fff;
border: 1px solid #c1c1c1;
border-radius: 4px;
cursor: pointer;
}
.el-dialog__resize {
position: absolute;
bottom: 0;
right: 0;
width: 10px;
height: 10px;
cursor: se-resize;
background-color: #c1c1c1;
}
</style>
```
```javascript
import Vue from "vue";
Vue.directive("dialogZoomOut", {
bind(el, binding, vnode, oldVnode) {
let minWidth = 400;
let minHeight = 300;
let isFullScreen = false;
let nowWidth = 0;
let nowHight = 0;
let nowMarginTop = 0;
const dialogHeaderEl = el.querySelector(".el-dialog__header");
const dragDom = el.querySelector(".el-dialog");
dragDom.style.overflow = "auto";
dialogHeaderEl.onselectstart = new Function("return false");
dialogHeaderEl.style.cursor = "move";
const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);
let moveDown = (e) => {
const disX = e.clientX - dialogHeaderEl.offsetLeft;
const disY = e.clientY - dialogHeaderEl.offsetTop;
let styL, styT;
if (sty.left.includes("%")) {
styL = +document.body.clientWidth * (+sty.left.replace(/%/g, "") / 100);
styT = +document.body.clientHeight * (+sty.top.replace(/%/g, "") / 100);
} else {
styL = +sty.left.replace(/px/g, "");
styT = +sty.top.replace(/px/g, "");
}
document.onmousemove = function (e) {
const l = e.clientX - disX;
const t = e.clientY - disY;
dragDom.style.left = `${l + styL}px`;
dragDom.style.top = `${t + styT}px`;
};
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
};
dialogHeaderEl.onmousedown = moveDown;
dialogHeaderEl.ondblclick = (e) => {
if (isFullScreen == false) {
nowHight = dragDom.clientHeight;
nowWidth = dragDom.clientWidth;
nowMarginTop = dragDom.style.marginTop;
dragDom.style.left = 0;
dragDom.style.top = 0;
dragDom.style.height = "100VH";
dragDom.style.width = "100VW";
dragDom.style.marginTop = 0;
isFullScreen = true;
dialogHeaderEl.style.cursor = "initial";
dialogHeaderEl.onmousedown = null;
} else {
dragDom.style.height = "auto";
dragDom.style.width = nowWidth + "px";
dragDom.style.marginTop = nowMarginTop;
isFullScreen = false;
dialogHeaderEl.style.cursor = "move";
dialogHeaderEl.onmousedown = moveDown;
}
};
let resizeEl = document.createElement("div");
dragDom.appendChild(resizeEl);
resizeEl.style.cursor = "se-resize";
resizeEl.style.position = "absolute";
resizeEl.style.height = "10px";
resizeEl.style.width = "10px";
resizeEl.style.right = "0px";
resizeEl.style.bottom = "0px";
resizeEl.style.zIndex = "99";
resizeEl.onmousedown = (e) => {
let clientX = e.clientX;
let disX = e.clientX - resizeEl.offsetLeft;
let disY = e.clientY - resizeEl.offsetTop;
document.onmousemove = function (e) {
e.preventDefault();
let x = e.clientX - disX + (e.clientX - clientX);
let y = e.clientY - disY;
dragDom.style.width = x > minWidth ? `${x}px` : minWidth + "px";
dragDom.style.height = y > minHeight ? `${y}px` : minHeight + "px";
};
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
};
},
});
```
上述代码实现了一个类似于Element UI中的Dialog组件的拖拽和缩放功能。在使用时,只需要将 `v-dialog-zoom-out` 指令绑定到Dialog组件的容器元素上,即可实现拖拽和缩放功能。