比较平滑的js控制textaera的高度

时间：2021-10-07 11:00:35|栏目：JavaScript代码|点击：次

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>佐佐制造 --textarea---addheight</title> <style type="text/css"> /* Reset style */ * { margin:0; padding:0; word-break:break-all; } body { background:#FFF; color:#333; font:12px/1.4em Helvetica, Arial, sans-serif; } h1, h2, h3, h4, h5, h6 { font-size:1em; } a { color:#333; text-decoration:none; }     a:hover { text-decoration:underline; } ul, li { list-style:none; } fieldset, img { border:none; } input, textarea, select, button { font:12px Helvetica, Arial, sans-serif; } .button { padding:0 10px; height: 22px; border: 1px solid; border-color: #EEE #999 #999 #EEE; background: #DDD; color: #333; line-height: 20px; cursor: pointer; margin-left:2px; } .submit { padding:0 10px; height: 22px; border: 1px solid; border-color: #DDD #CC8305 #CC8305 #DDD; background: #FFA200; color: #FFF; line-height: 20px; letter-spacing: 1px; cursor: pointer; } /* edit style */ #edit { width:300px; margin:50px; }     .edit_caption { width:100%; overflow:hidden; margin-bottom:1px; overflow:hidden; }     .edit_caption span { display:block; float:left; margin:0 1px; padding:4px 10px; background:#DDD; cursor:pointer; }     .edit_caption span:hover { background:#EEE; }     #edit textarea { width:300px; height:80px; margin:0; padding:0; } </style> <script type="text/javascript"> var addH=1; function addHeight() {   if (!document.getElementById('comment_content')) return flase;     var comment = document.getElementById('comment_content');     var nowH = parseInt(comment.style.height);     if (nowH < 250) {             nowH+=2;         comment.style.height=nowH+"px";         addH++;         if (addH > 25){              addH=1;         } else {         window.setTimeout("addHeight()","10");         }     } } function minHeight() {   if (!document.getElementById('comment_content')) return flase;     var comment = document.getElementById('comment_content');     var nowH = parseInt(comment.style.height);     if (nowH > 50) {         nowH-=2;         comment.style.height=nowH+"px";         addH++;         if (addH > 25){              addH=1;         } else {         window.setTimeout("minHeight()","10");         }     } } </script> </head> <body> <div id="edit">     <div class="edit_caption">         <span class="tool_bigger" onclick="addHeight()">放大</span>         <span class="tool_smaller" onclick="minHeight()">缩小</span>     </div>     <div><textarea id="comment_content" tabindex="1" rows="8" name="comment_content" style="height:100px"></textarea></div> </div> </body> </html>

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