实现div可以调整高度（div实现resize）
代码如下：
<!DOCTYPE html> <html> <head> <title>div实现textarea效果</title> <style> #textarea { height: 200px; width: 300px; padding: 4px; border: 1px solid #888; resize: vertical; overflow: auto; } #textarea:empty:before { content: attr(placeholder); color: #bbb; } </style> </head> <body> <div id="textarea" contenteditable="true" placeholder="请输入内容..."></div> </body> </html>
<!DOCTYPE html> <html> <head> <title>div监听resize事件</title> <style> .container { position: relative; width: 500px; height: 300px; background-color: black; padding: 4px; resize: vertical; overflow: auto; } .size-watch { width: 100%; height: 100%; position: absolute; visibility:hidden; margin: 0; padding: 0; border: 0; } </style> </head> <body > <div class="container" id="mapDiv" > hello </div> <script> function riseze (el, cb) { // 创建iframe标签，设置样式并插入到被监听元素中 var iframe = document.createElement(‘iframe‘); iframe.setAttribute(‘class‘, ‘size-watch‘); el.appendChild(iframe); // 记录元素当前宽高 var oldWidth = el.offsetWidth; var oldHeight = el.offsetHeight; // iframe 大小变化时的回调函数 function sizeChange () { // 记录元素变化后的宽高 var width = el.offsetWidth; var height = el.offsetHeight; // 不一致时触发回调函数 cb，并更新元素当前宽高 if (width !== oldWidth || height !== oldHeight) { cb({width: width, height: height}, {width: oldWidth, height: oldHeight}); oldWidth = width; oldHeight = height; } } // 设置定时器用于节流 var timer = 0; // 将 sizeChange 函数挂载到 iframe 的resize回调中 iframe.contentWindow.onresize = function () { clearTimeout(timer); timer = setTimeout(sizeChange, 20); }; } //var el = document.getElementById("mapDiv"); var el = document.querySelector(‘.container‘); riseze(el, (val, oldVal) => { console.log(`size changed！new: ${JSON.stringify(val)}, old: ${JSON.stringify(oldVal)}`); }); </script> </body> </html>
参考网站：
1、https://blog.csdn.net/liya_nan/article/details/81742370
2、https://segmentfault.com/a/1190000016550156
原文：https://www.cnblogs.com/BillyYoung/p/11209041.html