<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#main{
width: 300px;
padding: 20px;
margin: 10px auto;
background-color: yellow;
text-align: center;
}
</style>
</head>
<body>
<div id="main">
<p id="info"></p>
<img src="img/1.jpg"/>
<button id="pre">上一张</button>
<button id="next">下一张</button>
</ div>
</body>
<Script of the type = "text / JavaScript"> // get the button name element var pre = document.getElementById ( "pre" );
var the Next = document.getElementById ( "the Next" ); // create an array to save the image path, image switching picture is switched path var imgArr = [ "img / 1.jpg", "img / 2.jpg", "img / 3.jpg", "img / 4.jpg" ]; // Get img element, imparting img array element var img = document.getElementsByTagName ( "img") [0 ];
// Alert (img); // index (subscript array) create a saved image path var index = 0 ; // with the innerHTML < p> adding a prompt statement var info = document.getElementById ( "info");
function
Fun () {
info.innerHTML = "Total" + imgArr.length + "Zhang, now are" + (index + 1) + " Zhang" ;
}
Fun ();
// Create event handler for the two buttons.
= pre.onclick function () {
// Alert ( "Previous");
// switch to an index decrement
index the ;
// Analyzing the image to cycle, to prevent super-sector
IF (index < 0 ) {
index =-imgArr.length. 1 ;
}
img.src = imgArr [index];
Fun (); // call the function change <p> content
}
next.onclick =function () {
// Alert ( "next");
// switch to an index decrement
index ++ ;
IF (index>-imgArr.length. 1 ) {
index = 0 ;
}
img.src = imgArr [ index];
Fun ();
}
</ Script>
</ HTML>