本文实例为大家分享了js实现电灯开关效果的具体代码,供大家参考,具体内容如下
通过对js的一个学习,我们来完成一个模拟电灯开关的小案例。
首先对本案例进行一个分析,过程如下:
1.获取图片属性
2.绑定单击事件
3.点击时切换图片
1.通过按钮实现电灯开关
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<!DOCTYPE html> < html lang = "en" > < head > < meta charset = "UTF-8" > < title >Title</ title > </ head > < body > < img src = "imgs/on.gif" alt = "" id = "img" > < br > <!--图片--> < input type = "button" id = "bt1" value = "开" onclick = "f1()" > <!--按钮--> < button id = "bt2" onclick = "f2()" >关</ button > </ body > < script > function f1() {//开 let bt1=document.getElementById("bt1");//获取按钮id let img=document.getElementById("img");//获取图片id img.src="imgs/on.gif";//修改图片 } function f2() {//关 let bt2=document.getElementById("bt2"); let img=document.getElementById("img"); img.src="imgs/off.gif"; } </ script > </ html > |
运行结果:
2.通过点击电灯,实现开关
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<!DOCTYPE html> < html lang = "en" > < head > < meta charset = "UTF-8" > < title >Title</ title > </ head > < body > < img src = "imgs/off.gif" alt = "" id = "img" > < br > </ body > < script > let img=document.getElementById("img"); img.onclick=f; let flag=false; function f() { if (flag==true){ img.src="imgs/off.gif" flag=false; }else { img.src="imgs/on.gif" flag=true; } } </ script > </ html > |
简化版(利用三元运算符)
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<!DOCTYPE html> < html lang = "en" > < head > < meta charset = "UTF-8" > < title >Title</ title > </ head > < body > < img src = "imgs/on.gif" height = "180" width = "109" id = "img" onclick = "f()" > </ body > < script > let img = document.getElementById("img"); let i=0; function f() { img.src='imgs/'+(++i%2==0?'off':'on')+'.gif'; } </ script > </ html > |
运行结果
通过点击实现电灯的开关
电灯素材:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/qq_45850095/article/details/112709631