js的scroll详解

scrollTop : 滚动条滚动距离说明：chrome下他会以为滚动条是文档元素的，所以需要做兼容
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;

我们来验证下chrome是否存在兼容的问题：

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Document</title>

    <style>

        body{height:2000px;}

    </style>

</head>

<body>

    <script>

        document.onclick = function(){

            console.log(document.documentElement.scrollTop);

        }

    </script>

</body>

</html>

ie7/ie9: 分别做了3次点击

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" alt="" />

chrome下：三次点击都是0

aaarticlea/png;base64,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" alt="" />

scrollHeight 返回整个元素的高度+padding（包括子元素把父元素撑开隐蔽的地方）

说明:scrollHeight问题比较大

1、当子元素的高度大于父元素高度：标准浏览器下包含子元素样式高+padding+margin+border+父元素padding-top的值，ie7以下包含子元素样式高+padding+margin+border+父元素padding-top和padding-bottom

2、当子元素的高度小于父元素高度：标准浏览器下包含父元素样式高+padding，ie7以下只计算子元素的高度+父元素的padding

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Document</title>

    <style>

        body{height:2000px;}

        #d1{width:100px;height:100px;background:red;padding:10px;margin:10px;border:5px solid black;}

        #d1_1{width:100px;height:250px;background:blue;}

    </style>

</head>

<body>

    <div id="d1">

        <div id="d1_1"></div>

    </div>

    <script>

        document.onclick = function(){

            console.log(document.getElementById('d1').scrollHeight);

        }

    </script>

</body>

</html>

第一种情况下的ie9:

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" 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第一种情况下的ie7:

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" alt="" />

改一下父元素的高度，看下第二种情况：

#d1{width:100px;height:500px;background:red;padding:10px;margin:10px;border:5px solid black;}

第二种情况下的ie9:

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" 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第二种情况下的ie7:

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cCt4duCyGcC7bHJEfQx9I9LScejsQbI3GlHFfLE4GgGBXnz38Q/LL2HYLsx+m8yKk6XuW+XevGGnI+A93bctIdj+8sJ/uQyYbkXU5OxZfTh0x2H9Nd6aI/pfZJ966cpHPgOP/cQU4+JOfv+7WOneyIA8GuA4GqA7nv3nUgiJy9070rJxWOxMNjm+GxeFhHzvIjf/a0+HIwn41ukFPq3cNyGsfi4bF4eGwzHNnUklMKQU6pdw/Lcdg0jG2Gx5BDkaNztdYQ2WwY27w/thlFDkWOZzmb4QhnDkWO9r21TedqrWFsM7qSQA5Fjjc5GTb3xzajy9a3Xv7Rlc9OdktOsZ9vn6Xuczn3xzYbRtNyiv3wNYKc4ne/ysn8fc7o5v0sOcW+CvMa5BS/+1lOQySefW+t2A9fI8gpfpHjvs4p9sPXCHKK3/0sx2kDcpCDHF05DWPx+2Nx5CAHOVp3COINY/GGsTivc5CDHM3XOZF4QwQ5yEGO9h2CeIOXe2uDp55NfwyePTUohBCi9sWcD86LtdssdyHIKX73s5zwWDzz2Tc7yxk89WyWC4mI2hfTb619cQuh9A8LHuQUv/tZjvMiR+8OQRYNNw+NuIIyZ88u0UFO8buf5YT1X+fIDpKHXNyfrX0xEHj21KkXd+uKDTnF776V05hhc9/7vbWdD5zMj91VLXL2cPetnPC46V6weZEzeOpZycVXzuue2hcDgS3Xa1yt7dnuWzmN42Y4Ynp8nSNnIzmEso4Z2QFVqCCn+N23csIRMxwxPb3OeXijOZ2dbrRxV3qfdN/KaRw3G8fN8LgZjpj8TShykKNzteZcsCEHOcjRO3MipnPNhhzkIEfjexlkXuqkvyJ7sR++RpBT/O5POetmqinrdQ5ykIMcr3LSdwgiyEEOcnTPnK3fearYD18jyCl+96ecNTPVOB53jp3GceQgBzl632EXOchBjr6cxkjcuTeNHOQgR0dO5oINOchBjmc5E2bTRLxpPN40Hp9GDnKQ41FO84TZNG42RcymzHc7LPbD1whyit/9LKd5wmx2zpxV5CAHOVpyJszmCZOrNeQgx6ucBxPmA+QgBzlCX87DM4erNeQgx5OcROrBpPlgMn3sIAc5yNGW8wA5yEGOdzktk2bLBHKQgxwfcjKdQQ5ykONRTuuk2Yoc5CBH+JLjFDnIQY4nORuJVNuk6ZQzBznI0ZEzZTptnTJnDOQgBzne5LRPme0ZPMhBDnL05DidRQ5ykONVTtRMFznIQY53OR2xREc00RFNdEwl5gwbOchBjic5nbFEZyzRGU10RpGDHOQgJ3eKHOSooiWnK5ZwO7eGHOQgx4OczUSqGznIQY4TLTk904nuTOeRgxzkeJTTO231Tls901bPtIUc5CDHmxwr1TtjOe2ZsebXkYMc5HiT0zdjOe2dsRaQgxzkeJUza7lFDnKQ41VO/6zlFjnIQY4nOXErNTBruV1EDnKQg5ytU+QgRxVNOQm3yEEOcrzKGZxNuEUOcpDjWc5cwi1ykIMcr3KG5hNDc+kuIQc5yPEoZ3g+MTyXGJ5PDM8jBznI8SxnZN4ambfScjaQgxzkeJezYI0sWCPz1jJykIMcL3JMKzW6YDkdWUAOcpDjUY6dGlu0xhassQVrFDnIQY6enExXNpGDHOR4kxNZtNwiBznI8SxnyYosIQc5yNGUM75kuUUOcpCDnJwpcpCjipaciSXL7SpykIMcL3ISdmpy2XK7GkcOcpDjTc7Usu12NZ5EDnKQoylnxTaQgxzkeJQTXbGnMkUOcpDjUY6IrSbdriEHOcjxeObEVm23yEEOcpCTM0UOclTRkjO9ajtFDnKQ40fONHKQgxyPcqxkanrVnjHSRQ5ykONVzoyRfCjHRA5ykONJjpgxkpna68hBDnI8ypldS84ayVnDnkUOcpCjLyc5aySRgxzkeJUzt5aczRQ5yEGOhhy3yEEOcpCTM0UOclTRkjO/lnSKHOQgx4+c+bXkBnKQgxzkbJ0iBzmqaMlZWE/OZ7qRQA5ykONBjp0UixsppwsbqY1ECjnIQY7XM8ctZw5ykMNd6ZwpcpCjCl+HQDZFDnJU8S5nPZFqmbIztWYMvlIhcpDjQc5qPPXxsPXxkHVjyPp4KBFZQg5ykONNzo0h+8agdX3Quj6YGFtEDnKQoyPHwYMc5CBHR86QfWMIOchBjmc5K/HUx2k59g3kIAc53uXccOUMWRHkIAc5mldr9o0hm3tryEGO57vSQ7ZT5CAHOVp/n2N//PDM4XMIkIMc5GyZIgc5qmjLcYoc5CAHOXlT5CBHFeTIpshBjio+5QwjBznIQU7uFDnIUUVHjvjtcBI5yEGOEMiRT5GDHFV05bh4kIMc5HiWM5J08SAHOcjRkeN0OIkc5CAHOTlT5CBHFd9yxpGDHORoyxlJji8jBznIQc6WKXKQowpyZFPkIEcV5MimyEGOKsiRTZGDHFWQI5siBzmqIEc2RQ5yVEGObIoc5KiCHNkUOchRBTmyKXKQowpyZFPkIEcV5MimyEGOKsiRTZGDHFWQI5siBzmqIEc2RQ5yVEGObIoc5KiiJecmcpCDHCe6cm4iBznIEb7k3EQOcpCDHNkUOchRxZ+cm8hBDnKQkzdFDnJUQY5sihzkqIIc2RQ5yFEFObIpcpCjCnJkU+QgRxXkyKbIQY4qyJFNkYMcVZAjmyIHOaogRzZFDnJUQY5sihzkqIIc2RQ5yFEFObIpcpCjCnJkU+QgRxXkyKbIQY4qyJFNkYMcVZAjmyIHOaogRzZFDnJUQY5sihzkqIIc2RQ5yFEFObIpcpCjCnJkU+QgRxXkyKbIQY4qyJFNkYMcVZAjmyIHOaogRzZFDnJUQY5sihzkqIIc2RQ5yFEFObIpcpCjCnJkU+QgRxXkyKbIQY4qyJFNkYMcVZAjmyIHOaogRzZFDnJUQY5sihzkqIIc2RQ5yFFFS85vkYMc5DhBjmyKHOSoghzZFDnIUUVXjlPkIAc5yMmfIgc5qviT81vkIAc5yMmbIgc5qiBHNkUOclRBjmyKHOSoghzZFDnIUQU5silykKMKcmRT5CBHFeTIpshBjirIkU2RgxxVkCObIgc5qiBHNkUOclRBjmyKHOSoghzZFDnIUQU5silykKMKcmRT5CBHFeTIpshBjirIkU2RgxxVkCObIgc5qiBHNkUOclRBjmyKHOSoghzZFDnIUQU5silykKMKcmRT5CBHFeTIpshBjirIkU2RgxxVkCObIgc5qiBHNkUOclRBjmyKHOSoghzZFDnIUQU5silykKMKcmRT5CBHFeTIpshBjirIkU2RgxxV9OQMIwc5yBFCIEc+RQ5yVNGWM4wc5CAHOfIpcpCjih85w8hBDnL8yRlGDnKQ40/OEnKQgxzkbJkiBzmqIEc2RQ5yVEGObIoc5KiCHNkUOchRBTmyKXKQowpyZFPkIEcV5MimyEGOKsiRTZGDHFWQI5siBzmqIEc2RQ5yVEGObIoc5KiCHNkUOchRBTmyKXKQowpyZFPkIEcV5MimyEGOKsiRTZGDHFWQI5siBzmqIEc2RQ5yVNGS8zFykIMcJ8iRTZGDHFV05ThFDnKQg5z8KXKQowpyZFPkIEcVf3I+Hk5GkIMc5CBn6xQ5yFEFObIpcpCjCnJkU+QgRxXkyKbIQY4qyJFNdeTQQhU5pRnklHqRU5pBTqkXOaUZ5JR6kVOaQU6pFzmlGeSUepFTmkFOqRc5pRnklHqRU5pBTqkXOaUZ5JR6kVOaQU6pFzmlGeSUepFTmkFOqXevylmJp24ghyLHiZ6cIeRQ5AghtOXYyKHIEUJTzvUh+8aQfQM5FDl6cgat64O2c82GHIocr3LqBqzrg9aNIfvGEHIocjzK2UzVDSQyx46NHIocr3Ku9ZtpPMihyPEoZ3kzFeozrw0k6gat64PIocjxKicZ6ou7x87Yoo0cihxPcmp7N108yKHI8SZnI3m1Z6O2d9O5ZkMORY5XOVe616/2bNT2xq/1m8ihyPEq53LXehpPX3x00UIORY4nOTVda5e71q90b1zt3RxdQA5Fjgc5SxvJmk7jcteac+wghyLHoxy7ptPIHDvrI/MJ5FDkeJLzUYfhHjvIocjxKufDjtWPOoyazrXLXWvIocjRkrPqXLMNI4cix6uc9pXMsWMMz5nIocjxJOc37SsZPKtDyKHI0ZPTvvIhcihyNOS0rfymzcGzOjQXRw5Fjkc5yxk5K0OzyKHI0ZHzG+RQ5OjLcYocihxfcgaRQ5Gjc4cgjQc5FDkad6WRQ5EjhB85TpFDkaPz2TcZPMihyNH6vDUHTzt3CChyNOV8iByKHOTIpshBjir+5PA5BBQ5WnJWkUORIwRy5FPkIEcV3f+a+sN2p8ihyNGS04EcihzkyKfIQY4qfuR0rH7Yvoocihx9OR3819QUOcjJnSIHOaogRzZFDnJUQY5sihzkqIIc2RQ5yFEFObIpcpCjCnJkU+QgRxXkyKbIQY4qyJFNkYMcVbS+T+hHHQZyKHKE0JfzUYfxEXIocvTkdBofdRrOyYMcihzk5EyRgxxV/MjpND7qMJBDkYOcnClykKOKTzmdBt/tkCIHOTlT5CBHFeTIpshBjirIkU2RgxxVvMtZ3kjWIIcix4mmnDXkUOQIgRz5FDnIUUVPTtdaTedaDXIocrTkXO5aq+lCDkWOtpx199hBDkWOhhwXD3IocpCTM0UOclTxIcfpMHIocpCzdYoc5KiCHNkUOchR5RHkJJBDkYOc7ClykKOKhpzN5OVu5FDkCCGQI58iBzmqaMrZcPEghyLHq5wr3RtXMniQQ5GjJ+dK98bl7o3heeRQ5GjKuYIcihzk5E2RgxxV9OT0PJQzghyKHORsnSIHOapoytl08SCHIkdLThoPcihykJMzRQ5yVNGSczUtZ/NKzyZyKHI8ykltlWMhhyLHm5xe5FDkCCH05Vzt2byKHIocTTnxq71x5FDkIEc6RQ5yVPEjpzd+tRc5FDnIyZ0iBzmq+JUTH1lADkUOcrZMkYMcVZAjmyIHOapoyalFDkWOEz05ffFa5FDkCG05posHORQ5yMmZIgc5qujLcYocihzk5E6RgxxVfMsZRQ5Fjr4cEzkUOcjJmSIHOaogRzZFDnJUQY5sihzkqIIc2RQ5yFHFu5wV5FDkuNGSE+pHDkWOEEJLThw5FDmZaMpJuHiQQ5HjVc61gcS1DB7kUOToykmEkEORoycngwc5FDmacgYSof7E6CJyKHI05VzrT4wu2sihyNGUM4Acihzk5E6RgxxVkCObIgc5qiBHNkUOclRBjmyKHOSoghzZFDnIUUVTjoUcihwh/MhxihyKHOTkTpGDHFX8yrGQQ5GDnJwpcpCjCnJkU+QgRxXkyKbIQY4qyJFNkYMcVZAjmyIHOaogRzZFDnJUQY5sihzkqIIc2RQ5yFFFS04dcihynOjJGbSRQ5EjBHLkU+QgRxVdOXWDdh1yKHL8yBm0kUOR40dOHXIocvzIGbTHkEORg5ytU+QgR5VHkJNEDkUOcrKnyEGOKsiRTZGDHFWQI5siBzmqIEc2RQ5yVEGObIoc5KiCHNkUOchRBTmyKXKQowpyZFPkIEcVHTkCORQ56WjJuT6URA5FjhDIkU+RgxxVdOW4eJBDkYOcnClykKOKDznXh5J1g0nkUORoy7k+lBxbQg5FDnK2TJGDHFWQI5siBzmqIEc2RQ5yVEGObIoc5KiCHNkUOchRBTmyKXKQowpyZFPkIEcV5MimyEGOKsiRTZGDHFWQI5siBzmqIEc2RQ5yVEGObIoc5KiCHNkUOchRBTmyKXKQowpyZFPkIEcV5MimyEGOKsiRTZGDHFWQI5siBzmqaH6NT+RQ5AghtL/GZ7Ju0K5DDkWOnpyhZB1nDkWO0L9aqxtK1g0m6waRQ5GDnNwpcpCjih85XK1R5Pj6/jnJuiG+xidFjj85nDkUOR7lXHv4naeQQ5HjXc5A1vdsQw5FDnK2TpGDHFU05GymQgPWtQHrGt8/hyLHj4t6qO8AAAK/SURBVJwB69oAcihyvMlZ3kyF+hMZPPYocihyPMqp7U+4eJBDkeNPjo0cihxvcvoStX2JUH8i1I8cihwNOWZGTgI5FDle5VztM2v7ErXIocjRl+MUORQ53uX0mld7kUOR40uOg2d0ATkUOZpyrvaZowsWcihyPMqJu3iQQ5GjJSeNZwQ5FDke5VzpiV/J4EEORY6OnB7kUOToyumNu8cOcihyNOX0xK8ghyIHOXlT5CBHFR/31hw/yKHI0fqb0IyceeRQ5OjK6UUORY6Pz75BDkUOcvKmyEGOKv7lcIeAIkdfDp9DQJGDnNwpcpCjCnJkU+QgRxXkyKbIQY4qyJFNkYMcVZAjmyIHOaogRzZFDnJUQY5sihzkqKL7lQqv9iGHIgc58ilykKOKHzl9yKHI8SenDzkUOcjJnSIHOaogRzZFDnJUQY5sihzkqIIc2RQ5yFEFObIpcpCjCnJkU+QgRxXkyKbIQY4qyJFNkYMcVZAjmyIHOaogRzZFDnJU0ZJT25dADkWOEMiRT5GDHFV05bh4kEOR41lOf6K2P40HORQ5yMmZIgc5qviR05+o7UsghyJHX05/YnTBRg5Fjr6cReRQ5CBnyxQ5yFEFObIpcpCjCnJkU+QgRxXkyKakBLJ7T4WCBDmyKSmB7N5ToSBBjmxKSiC791QoSJAjm5ISyO49FQoS73JWNlO1/RZyyGPK7j0VChINOfFUqN9y8exlOYQooydnwHLxIIfs6yCHED/RljNghfqtUL+FHLKv40fOAHLIvg9yCPETn3IGkEP2d5BDiJ8ghxA/QQ4hfoIcQvwEOYT4CXII8RPkEOInyCHET5BDiJ9oyrGRQ4gQyCHEX/Tl2MghRE/OtQH7GnIIEcghxF98ybFDAzZyyL6ODznXkEPII8hJIofs3/iTcw05ZJ8HOYT4CXII8ZP9I+f/A3emriQeKb8YAAAAAElFTkSuQmCC" alt="" />

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