This article introduces two ways of javascript image switching, loop switching and sequence switching example code, to share for your reference, the specific content is as follows
<html>
<head>
<meta charset="utf-8">
<style>
p{margin:0;}
input{border:none;outline: none;margin:0;padding:0;}
img{width:300px;height:300px;}
#loop{margin-left:50px;background:#c80;width:60px;height:40px;font-size:14px;line-height:20px;text-align: center;}
#order{margin-left:50px;background:#c80;width:60px;height:40px;font-size:14px;line-height:20px;text-align:center;}
div{width:300px;height:300px;position:relative;}
span{position:absolute;left:0;top:0;width:300px;height:20px;font-size:14px;line-height:20px;background:#000;opacity:0.5;color:#fff;text-align: center;}
div p{position:absolute;left:0;bottom:0;width:300px;height:20px;font-size:14px;line-height:20px;text-align: center;color:#fff;background:#000;opacity:0.5;}
div input{position:absolute;width:60px;height:60px;top:100px;background:pink;}
#back{left:0;}
#next{right:0;}
</style>
<script type="text/javascript">
window.onload=function(){
// switching
var oNext=document.getElementById("next");
var oBack=document.getElementById("back");
var oImg=document.getElementById("img");
var oText=document.getElementById("text");
var oSpan=document.getElementById("span");
var oLoop=document.getElementById("loop");
var Oorder=document.getElementById('order');
var oText1=document.getElementById("text1");
var aImg=["img/1.jpg","img/2.jpg","img/3.jpg","img/4.jpg"];
var aText=[" The picture 1"," The picture 2"," The picture 3"," The picture 4"];
var num=0;
// Click on the 1 Zhang event
function next(){
num=num+1; // Every time add 1
// Make a judgment if num Greater than the last 1 zhang , Picture return control 1 zhang
//// 1 2 3 4
if(num>aImg.length-1){
num=0;
}
oImg.src=aImg[num];
oText.innerHTML=aText[num];// Image information changes, associated with the array
oSpan.innerHTML=(num+1)+"/"+aImg.length;// Change in quantity, associated with an array
//alert(num);
}
function back(){
num=num-1;
// Make a judgment if the picture is less than the 1 zhang , Go back to the end 1 zhang
if(num<0){
num=aImg.length-1;
}
oImg.src=aImg[num];
oText.innerHTML=aText[num];// Image information changes, associated with the array
oSpan.innerHTML=(num+1)+"/"+aImg.length;// Change in quantity, associated with an array
}
function next1(){
num=num+1; // Every time add 1
// Make a judgment if num Greater than the last 1 zhang , Pop up a warning and leave the picture at the end 1 zhang
//// 1 2 3 4
if(num>aImg.length-1){
num=aImg.length-1;
alert(" The last 1 Zhang the ");
}
oImg.src=aImg[num];
oText.innerHTML=aText[num];
oSpan.innerHTML=num+1+"/"+aImg.length;
//alert(num);
}
function back1(){
num=num-1;
// Make a judgment if the picture is less than the 1 When it does, a warning will pop up and the picture will be set at no 1 zhang
if(num<0){
num=0;
alert(" Is the first 1 Zhang the ");
}
oImg.src=aImg[num];
oText.innerHTML=aText[num];
oSpan.innerHTML=num+1+"/"+aImg.length;
}
oNext.onclick=next;
oBack.onclick=back;
oLoop.onclick=function(){
oText1.innerHTML=" Pictures can be viewed from no 1 Tickets to the final 1 Zhang loop switch ";
oNext.onclick=next;
oBack.onclick=back;
}
Oorder.onclick=function(){
oText1.innerHTML=" Pictures can only be from the first 1 Tickets to the final 1 Zhang sequence switching ";
oNext.onclick=next1;
oBack.onclick=back1;
}
}
</script>
</head>
<body>
<input id="loop" type="button" name="" value=" switching "/>
<input id="order"type="button" name="" value=" Sequence switch "/>
<p id="text1"> Pictures can be viewed from no 1 Tickets to the final 1 Zhang loop switch </p>
<div>
<input id="back" type="button" name="" value=" on 1 zhang "/>
<input id="next" type="button" name="" value=" Under the 1 zhang "/>
<img id="img" src="img/1.jpg"/>
<span id="span">1/4</span>
<p id="text"> The picture 1</p>
</div>
</body>
</html>Picture switch means two pictures switch in turn code:
<html lang="en">
<head>
<meta charset="utf-8">
<style>
#text{width:200px;height:200px;font-size:40px;line-height:40px;text-align: center;}
img{width:200px;height:200px;}
</style>
<script type="text/javascript">
window.onload=function(){
var oBtn=document.getElementById("btn");
var oImg=document.getElementById("img");
var oText=document.getElementById("text");
var onOff=true;
oBtn.onclick=function(){
if(onOff){
oImg.src="img/7.jpg";
oText.innerHTML=" The picture 2";
onOff=false;
}
else{
oImg.src="img/5.jpg";
oText.innerHTML=" The picture 1";
onOff=true;
}
}
}
</script>
</head>
<body>
<input id="btn" type="button" name="" value=" Switch the picture "/>
<img id="img" src="img/5.jpg"/>
<p id="text"> The picture 1</p>
</body>
</html>That is the end of this article, I hope to help you learn javascript programming.