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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- <style>
- #box{
- width: 100px;
- height: 100px;
- background-color: red;
- }
- </style>
- </head>
- <body>
- <div id="box"></div>
- <script>
- var oBox = document.getElementById("box");
- oBox.onmouseenter = function(){
- // oBox.style.height = "600px";
- var thisHeight = oBox.offsetHeight;
- console.log(thisHeight);
- setInterval(function(){
- thisHeight += 10;
- oBox.style.height =thisHeight + "px";
- },16)
- }
- </script>
- </body>
- </html>
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