本篇文章给大家带来了关于JavaScript的相关知识，其中主要跟大家介绍怎么通过简单的CSS及JS实现一下新手引导效果，感兴趣的朋友下面一起来看一下吧，希望对大家有帮助。
【资料图】
废话开篇：通过一些简单 CSS及 JS实现一下新手引导效果
一、实现效果
二、实现
实现其实很简单，mask蒙版就是平铺一个整屏的 div，设置背景颜色为透明 transparent，然后，再设置 outline为半透明及足够宽就可以了，再用同样的方式创建一个 箭头跟 警告标签。
1、用法
let maskIntroduceManage = new MaskIntroduceManage([ new MaskIntroduceItem("one","人生若只如初见"), new MaskIntroduceItem("two","何事秋风悲画扇"), new MaskIntroduceItem("five","等闲却变故人心"), new MaskIntroduceItem("six","骊山语罢清宵半"), new MaskIntroduceItem("four","却道故人心易变"), new MaskIntroduceItem("finally","谢谢大家支持！")])maskIntroduceManage.benginIntroduce()2、HTML
<!DOCTYPE html><html><head><meta charset="utf-8"></head><style type="text/css">*{ padding: 0; margin: 0;}.content { padding: 0; display: flex; flex-direction: row; justify-content: space-between; align-items: center; width: 100%;}span { width: 60px; height: 60px; line-height: 60px; margin-left: 40px; margin-top: 140px; margin-bottom: 0px; text-align: center; display: block; background-color: antiquewhite;}.finally { width: 100px; height: 100px; background-color: cornsilk; border-radius: 50%; line-height: 100px; text-align: center; margin-top: 30px; margin-left: auto; margin-right: auto;}span:nth-of-type(1){ margin-top: 30px;}span:nth-of-type(2){ margin-top: 70px;}span:nth-of-type(3){ margin-top: 160px;}span:nth-of-type(4){ margin-top: 160px;}span:nth-of-type(5){ margin-top: 70px;}span:nth-of-type(6){ margin-top: 30px;}</style><body><div class="content"> <span id="one">纳</span> <span id="two">兰</span> <span id="three">容</span> <span id="four">若</span> <span id="five">作</span> <span id="six">词</span></div><div class="finally" id="finally"> 谢谢</div></body><script src="./maskIntroduce.js"></script><script>let maskIntroduceManage = new MaskIntroduceManage([ new MaskIntroduceItem("one","人生若只如初见"), new MaskIntroduceItem("two","何事秋风悲画扇"), new MaskIntroduceItem("five","等闲却变故人心"), new MaskIntroduceItem("six","骊山语罢清宵半"), new MaskIntroduceItem("four","却道故人心易变"), new MaskIntroduceItem("finally","谢谢大家支持！")])maskIntroduceManage.benginIntroduce()</script></html>3、JS
// 单元信息modelclass MaskIntroduceItem { // 需要引导的dom的ID id // 需要引导的dom功能描述 warming constructor(id,warming){ this.id = id this.warming = warming }}// 遮罩操作类class MaskIntroduceManage { // 消息展示类集合 maskIntroduceItems // 遮罩层 el // 遮罩层提示框 warmingEl // 指引肩头 guidanceEl // 展示的第几个 currentShowIndex = 0 // 记录window事件 windowEvent = null constructor(maskIntroduceItems){ this.maskIntroduceItems = maskIntroduceItems } // 添加消息展示类 addIntroduceItem(introduceItem){ this.maskIntroduceItems.push(introduceItem) } // body增加遮罩 addMaskToBody(){ //添加遮罩框 this.el = document.createElement("div") this.el.style.cssText = "position: fixed;background: transparent;outline:rgba(0, 0, 0, 0.5) 3500px solid;" let body = document.getElementsByTagName("body")[0] body.appendChild(this.el) //添加提示框 this.warmingEl = document.createElement("div") this.warmingEl.style.cssText = "position:fixed;width:100px;background:white;border-radius: 10px;padding: 30px;font-size: 14px;" body.appendChild(this.warmingEl) //添加指引箭头 this.guidanceEl = document.createElement("div") this.guidanceEl.style.cssText = "position:fixed;width: 14px; height: 13px; background-color: white;clip-path: polygon(50% 0,100% 100%,0 100%);" body.appendChild(this.guidanceEl) //设置body禁止滚动 body.style.overflow = "hidden" //保留window事件 if(window.onclick){ this.windowEvent = window.onclick } window.onclick = ()=>{ this.nextIntroduce() } } // 开始引导 benginIntroduce(){ this.addMaskToBody() this.nextIntroduce() } // 下一步 nextIntroduce(){ let maskIntroduceItem = this.maskIntroduceItems.length > 0 ? this.maskIntroduceItems[this.currentShowIndex] : null if(!maskIntroduceItem){ return } let needIntroduceEl = document.getElementById(maskIntroduceItem.id) //遮罩层的镂空位置 this.el.style.width = needIntroduceEl.offsetWidth + "px" this.el.style.height = needIntroduceEl.offsetHeight + "px" this.el.style.top = this.getElementPosition(needIntroduceEl).top + "px" this.el.style.left = this.getElementPosition(needIntroduceEl).left + "px" //设置对应倒角，但是由于背景颜色是透明的，所以，没有效果（???） //this.el.style.borderRadius = window.getComputedStyle(needIntroduceEl,null)["border-radius"] this.currentShowIndex ++ //指引箭头位置 let guidanceElLeft = this.getElementPosition(needIntroduceEl).left + needIntroduceEl.offsetWidth / 2.0 this.guidanceEl.style.top = this.getElementPosition(needIntroduceEl).top + needIntroduceEl.offsetHeight + 20 + "px" this.guidanceEl.style.left = guidanceElLeft + "px" //提示框的位置 this.warmingEl.style.top = this.getElementPosition(this.guidanceEl).top + this.guidanceEl.offsetHeight - 4 + "px" let warmingElLeft = this.getElementPosition(needIntroduceEl).left - ((this.warmingEl.offsetWidth - needIntroduceEl.offsetWidth) / 2.0) if(warmingElLeft < 0){ warmingElLeft = this.getElementPosition(needIntroduceEl).left + 10 } if(warmingElLeft + this.warmingEl.offsetWidth > document.getElementsByTagName("body")[0].offsetWidth){ warmingElLeft = warmingElLeft - 10 - (this.warmingEl.offsetWidth - needIntroduceEl.offsetWidth) / 2.0 } this.warmingEl.style.left = warmingElLeft + "px" this.warmingEl.innerHTML = maskIntroduceItem.warming //最后一个展示完恢复window点击事件 if(this.currentShowIndex >= this.maskIntroduceItems.length){ setTimeout(() => { //移除当前遮罩 this.el.remove() //移除当前提示框 this.warmingEl.remove() //移除箭头 this.guidanceEl.remove() //设置body可以滚动 document.getElementsByTagName("body")[0].style.overflow = "auto" //恢复window事件 if(this.windowEvent){ window.onclick = this.windowEvent } }, 2000); } } // 获取元素在屏幕的位置 getElementPosition(element){ var top = element.offsetTop var left = element.offsetLeft var currentParent = element.offsetParent; while (currentParent !== null) { top += currentParent.offsetTop left += currentParent.offsetLeft currentParent = currentParent.offsetParent } return {top,left} }}三、总结与思考
实现原理特别简单，没有太多复杂的逻辑在里面，想通过当前“需要介绍”的标签的 borderRadius来设置镂空部分的倒角值，但是背景颜色是透明的，因此设置了，可以生效但也没有效果。代码拙劣，大神勿笑~
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