本文实例为大家分享了图片缓慢放大缩小js实现代码，供大家参考，具体内容如下
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>图片的缓慢缩放</title>
</head>
<script>
window.onload = function(){
var btn_big = document.getElementById("big");
var btn_small = document.getElementById("small");
var pic = document.getElementById("pic");
//缓慢放大
btn_big.onclick = function(){
var width = parseInt(pic.style.width);
var i = width;
var count = 0;
console.log(width);
var timer = setInterval(function(){
count++;
i++;
pic.style.width = i + "%";
if(count == 10 ){
clearInterval(timer);
}else if( i > 50){
btn_big.onclick = function(e){
btn_big.onclick = null;
};
}
},13);
};
//缓慢缩小
btn_small.onclick = function(){
var width = parseInt(pic.style.width);
var count = 0;
if(width == 10){
alert("图片已最小!!");
return false;
}
console.log(width);
var timer2 = setInterval(function(){
count++;
width--;
pic.style.width = width +"%";
if(count == 10){
clearInterval(timer2);
}else if( width < 10){
btn_small.onclick = null;
}
},13);
}
}
</script>
<style>
#pic{
width: 20%;
}
</style>
<body>
<div id="pic" style="width: 20%">
<img src="3.pic.jpg" style="width:100%;">
</div>
<div class="scale">
<button id="big">放大</button> <button id="small">缩小</button>
</div>
</body>
</html>
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phpstudy。