<!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> <img src="https://www.jb51.net/3.pic.jpg"> </div> <div> <button>放大</button> <button>缩小</button> </div> </body> </html>
js实现图片缓慢放大缩小效果
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