<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> * { margin: 0; padding: 0; } #demo { width: 100px; height: 100px; /*position: absolute;*/ background-color: pink; } </style> </head> <body> <div id="demo" style="left:100px"></div> </body> </html> <script> var demo = document.getElementById("demo"); console.log(demo.offsetLeft); //打印出來的是0 console.log(demo.style.left); //打印出來的是100px </script>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> * { margin: 0; padding: 0; } #father { width: 200px; height: 200px; margin: 100px;/*不是到margin左側的距離*/ padding: 50px; border: 10px solid blue; position: absolute; background-color: pink; } #son { width: 50px; height: 50px; background-color: red; } </style> </head> <body> <div id="father"> <div id="son"></div> </div> </body> </html> <script> var son = document.getElementById("son"); console.log(son.offsetLeft); //打印出來是 50px; </script>
