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javascript基础——图片切换以及模拟短信发送

2015-04-11 14:34 423 查看
DEMO1：两张图片来回切换

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS点击两张图片来回切换</title>
<script>
window.onload = function(){

// 获取元素
var oImg = document.getElementById('img1');

// 定义一个自定义开关 默认为true
var onOff = true;

oImg.onclick = function(){

if(onOff){
oImg.src = 'img/2.jpg';
}else{
oImg.src = 'img/1.jpg';
}
// 取反
onOff = !onOff;
};
};
</script>
</head>
<body>
<img id="img1" src="img/1.jpg" />
</body>
</html>


DEMO2：点击图片，循环切换（多张）

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>点击图片循环切换——多张</title>
<script>
window.onload = function(){

// 获取相关元素
var oImg = document.getElementById('img1');
var arr = ['img/1.jpg','img/2.jpg','img/3.jpg','img/4.jpg'];
var num = 0;

oImg.onclick = function(){

num ++;

if(num == arr.length){
num = 0;
}
oImg.src = arr[num];
};
};
</script>
</head>
<body>
<img id="img1" src = 'img/1.jpg' />
</body>
</html>


DEMO3：点击按钮图片切换综合实例

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body { text-align:center; }
p { margin:0; }
#box { width:400px; height:400px; border:10px solid #ccc; margin:50px auto 0; position:relative; background: url(img/loading.gif) center center no-repeat; }
a { width:40px; height:40px; background:#fff; filter:alpha(opacity:80); opacity:0.8; position:absolute; top:160px; font-size:18px; color:#000; text-align:center; line-height:40px; text-decoration:none; }
a:hover { filter:alpha(opacity:30); opacity:0.3; }
#prev { left:10px; }
#next { right:10px; }
#p1 { width:400px; height:30px; line-height:30px; text-align:center; background:#000; color:#fff; font-size:14px; filter:alpha(opacity:80); opacity:0.8; position:absolute; bottom:0; left:0; }
strong { width:400px; height:30px; line-height:30px; text-align:center; background:#000; color:#fff; font-size:14px; filter:alpha(opacity:80); opacity:0.8; position:absolute; top:0; left:0; }
#img1 { width:400px; height:400px; }
span { position:absolute; width:400px; height:30px; line-height:30px; text-align:center; top:-50px; left:0; font-family:'微软雅黑'; }
</style>
<script>
window.onload = function(){

// 获取相关元素
var oPrev = document.getElementById('prev');
var oNext = document.getElementById('next');
var oStrong = document.getElementById('strong1');
var oP = document.getElementById('p1');
var oImg = document.getElementById('img1');
var aBtn = document.getElementsByTagName('input');
var oSpan = document.getElementById('span1');

var arrUrl = ['img/1.jpg' ,'img/2.jpg' ,'img/3.jpg' ,'img/4.jpg' ,'img/5.jpg'];
var arrText = ['图片一','图片二','图片三','图片四','图片五'];
var num = 0;
var onOff = true;

// 初始化
function init(){
oStrong.innerHTML = num+1 +'/'+ arrText.length;
oImg.src = arrUrl[num];
oP.innerHTML = arrText[num];
};
init();

// 向左切换
oPrev.onclick = function(){

num--;
if(num == -1){
if(onOff){
num = arrUrl.length-1;
}else{
alert('已经到第一张了！');
num = 0;
}
}
init();
};

// 向右切换
oNext.onclick = function(){

num++;
if(num == arrUrl.length){
if(onOff){
num = 0;
}else{
alert('已经到最后一张了！');
num = arrUrl.length-1;
}
}
init();
};

// 循环切换
aBtn[0].onclick = function(){
onOff = true;
oSpan.innerHTML = '图片可以从最后一张跳转到第一张循环切换';
};

// 顺序切换
aBtn[1].onclick = function(){
onOff = false;
oSpan.innerHTML = '图片只能到最后一张或只能到第一张';
};
};
</script>
</head>
<body>
<input type="button" value="循环切换" />
<input type="button" value="顺序切换" />

<div id="box">
<span id="span1">图片可以从最后一张跳转到第一张循环切换</span>
<a href="javascript:;" id="prev"><</a>
<a href="javascript:;" id="next">></a>
<strong id="strong1">图片数量计算中...</strong>
<p id="p1">图片文字加载中...</p>
<img id="img1" />
</div>
</body>
</html>


综合实例二：模拟短信发送

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>模拟手机发短信</title>
<style>
#box{ width:320px; height:400px; border:10px solid #ccc; margin:0 auto;}
#div1{ width:320px; height:370px; background:#fafafa; overflow:auto;}
img{ width:24px; height:24px;}

p{ position:relative; margin:0 0 5px 0; word-break:break-all; word-wrap:break-word; overflow:hidden;}
p img{ position:absolute; top:0;}
.left{ padding-left:30px;}
.right{ padding-right:30px;}
.left img{ left:0;}
.right img{ right:0;}
.left span{ float:left; padding:5px; background:#FFC;}
.right span{ float:right; padding:5px; background:#FCF;}
</style>
<script>
window.onload = function(){

// 获取元素
var oDiv = document.getElementById('div1');
var oImg = document.getElementById('img1');
var oText = document.getElementById('text1');
var oBtn = document.getElementById('btn1');
var onOff = true;

// 小头像切换
oImg.onclick = function(){
if(onOff){
oImg.src = 'img/2.jpg';
}else{
oImg.src = 'img/1.jpg';
}
onOff = !onOff;
};

// 发送信息
oBtn.onclick = function(){

var sClass = 'left';
if(onOff){
sClass = 'left';
}else{
sClass = 'right';
}

oDiv.innerHTML = '<p class=" '+sClass+' ">' +
'<img src=" '+oImg.src+' ">' +
'<span>' +oText.value+ '</span>' +
'</p>' + oDiv.innerHTML;
oText.value = '';
};
};
</script>
</head>
<body>
<div id="box">
<div id="div1">
<!-- <p class="left">
<img src="img/1.jpg">
<span>文字1~~~</span>
</p>

<p class="right">
<img src="img/2.jpg">
<span>文字2~~~</span>
</p> -->
</div>
<img src="img/1.jpg" alt="" id="img1">
<input type="text" name="" id="text1">
<input type="button" value="发送" id="btn1">
</div>
</body>
</html>
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