是否有跨浏览器的CSS/JavaScript技术来显示一个长HTML表,使列标题保持固定在屏幕上,而不随表体滚动。想想微软Excel中的“冻结窗格”效果。
我希望能够滚动表的内容,但总是能够在顶部看到列标题。
是否有跨浏览器的CSS/JavaScript技术来显示一个长HTML表,使列标题保持固定在屏幕上,而不随表体滚动。想想微软Excel中的“冻结窗格”效果。
我希望能够滚动表的内容,但总是能够在顶部看到列标题。
当前回答
这可以在四行代码中清晰地解决。
如果您只关心现代浏览器,那么使用CSS转换可以更容易地实现固定标头。听起来很奇怪,但效果很好:
HTML和CSS保持原样。 没有外部JavaScript依赖。 四行代码。 适用于所有配置(表布局:固定等)。
document.getElementById("wrap").addEventListener("scroll", function(){
var translate = "translate(0,"+this.scrollTop+"px)";
this.querySelector("thead").style.transform = translate;
});
除了Internet Explorer 8-,对CSS转换的支持广泛可用。
下面是完整的例子供参考:
document.getElementById("wrap").addEventListener("scroll",function(){ var translate = "translate(0,"+this.scrollTop+"px)"; this.querySelector("thead").style.transform = translate; }); /* Your existing container */ #wrap { overflow: auto; height: 400px; } /* CSS for demo */ td { background-color: green; width: 200px; height: 100px; } <div id="wrap"> <table> <thead> <tr> <th>Foo</th> <th>Bar</th> </tr> </thead> <tbody> <tr><td></td><td></td></tr> <tr><td></td><td></td></tr> <tr><td></td><td></td></tr> <tr><td></td><td></td></tr> <tr><td></td><td></td></tr> <tr><td></td><td></td></tr> <tr><td></td><td></td></tr> <tr><td></td><td></td></tr> <tr><td></td><td></td></tr> <tr><td></td><td></td></tr> <tr><td></td><td></td></tr> <tr><td></td><td></td></tr> </tbody> </table> </div>
其他回答
我喜欢Maximillian Hils的回答,但我有一些问题:
这个变换在Edge或IE中不起作用,除非你把它应用到第th项上 在Edge和IE中滚动时,标题会闪烁 我的表是使用ajax加载的,所以我想附加到窗口滚动事件,而不是包装器的滚动事件
为了摆脱闪烁,我使用一个超时等待,直到用户完成滚动,然后我应用转换-所以在滚动期间头是不可见的。
我还使用jQuery编写了这篇文章,其优点之一是jQuery可以为您处理供应商前缀
var isScrolling, lastTop, lastLeft, isLeftHidden, isTopHidden;
//Scroll events don't bubble https://stackoverflow.com/a/19375645/150342
//so can't use $(document).on("scroll", ".table-container-fixed", function (e) {
document.addEventListener('scroll', function (event) {
var $container = $(event.target);
if (!$container.hasClass("table-container-fixed"))
return;
//transform needs to be applied to th for Edge and IE
//in this example I am also fixing the leftmost column
var $topLeftCell = $container.find('table:first > thead > tr > th:first');
var $headerCells = $topLeftCell.siblings();
var $columnCells = $container
.find('table:first > tbody > tr > td:first-child, ' +
'table:first > tfoot > tr > td:first-child');
//hide the cells while returning otherwise they show on top of the data
if (!isLeftHidden) {
var currentLeft = $container.scrollLeft();
if (currentLeft < lastLeft) {
//scrolling left
isLeftHidden = true;
$topLeftCell.css('visibility', 'hidden');
$columnCells.css('visibility', 'hidden');
}
lastLeft = currentLeft;
}
if (!isTopHidden) {
var currentTop = $container.scrollTop();
if (currentTop < lastTop) {
//scrolling up
isTopHidden = true;
$topLeftCell.css('visibility', 'hidden');
$headerCells.css('visibility', 'hidden');
}
lastTop = currentTop;
}
// Using timeout to delay transform until user stops scrolling
// Clear timeout while scrolling
window.clearTimeout(isScrolling);
// Set a timeout to run after scrolling ends
isScrolling = setTimeout(function () {
//move the table cells.
var x = $container.scrollLeft();
var y = $container.scrollTop();
$topLeftCell.css('transform', 'translate(' + x + 'px, ' + y + 'px)');
$headerCells.css('transform', 'translateY(' + y + 'px)');
$columnCells.css('transform', 'translateX(' + x + 'px)');
isTopHidden = isLeftHidden = false;
$topLeftCell.css('visibility', 'inherit');
$headerCells.css('visibility', 'inherit');
$columnCells.css('visibility', 'inherit');
}, 100);
}, true);
表被包装在一个div中,类table-container-fixed。
.table-container-fixed{
overflow: auto;
height: 400px;
}
我将border-collapse设置为分开,否则在翻译过程中就会丢失边界,并且我删除了表上的边界,以防止内容在滚动过程中刚好出现在边界所在的单元格上方。
.table-container-fixed > table {
border-collapse: separate;
border:none;
}
我将th背景设置为白色以覆盖下面的单元格,并添加了与表格边框相匹配的边框——使用Bootstrap样式并滚动出视图。
.table-container-fixed > table > thead > tr > th {
border-top: 1px solid #ddd !important;
background-color: white;
z-index: 10;
position: relative;/*to make z-index work*/
}
.table-container-fixed > table > thead > tr > th:first-child {
z-index: 20;
}
.table-container-fixed > table > tbody > tr > td:first-child,
.table-container-fixed > table > tfoot > tr > td:first-child {
background-color: white;
z-index: 10;
position: relative;
}
通过将StickyTableHeaders jQuery插件应用到表格中,当你向下滚动时,列标题将粘在视口的顶部。
例子:
$(function () { $("table").stickyTableHeaders(); }); /*! Copyright (c) 2011 by Jonas Mosbech - https://github.com/jmosbech/StickyTableHeaders MIT license info: https://github.com/jmosbech/StickyTableHeaders/blob/master/license.txt */ ; (function ($, window, undefined) { 'use strict'; var name = 'stickyTableHeaders', id = 0, defaults = { fixedOffset: 0, leftOffset: 0, marginTop: 0, scrollableArea: window }; function Plugin(el, options) { // To avoid scope issues, use 'base' instead of 'this' // to reference this class from internal events and functions. var base = this; // Access to jQuery and DOM versions of element base.$el = $(el); base.el = el; base.id = id++; base.$window = $(window); base.$document = $(document); // Listen for destroyed, call teardown base.$el.bind('destroyed', $.proxy(base.teardown, base)); // Cache DOM refs for performance reasons base.$clonedHeader = null; base.$originalHeader = null; // Keep track of state base.isSticky = false; base.hasBeenSticky = false; base.leftOffset = null; base.topOffset = null; base.init = function () { base.$el.each(function () { var $this = $(this); // remove padding on <table> to fix issue #7 $this.css('padding', 0); base.$originalHeader = $('thead:first', this); base.$clonedHeader = base.$originalHeader.clone(); $this.trigger('clonedHeader.' + name, [base.$clonedHeader]); base.$clonedHeader.addClass('tableFloatingHeader'); base.$clonedHeader.css('display', 'none'); base.$originalHeader.addClass('tableFloatingHeaderOriginal'); base.$originalHeader.after(base.$clonedHeader); base.$printStyle = $('<style type="text/css" media="print">' + '.tableFloatingHeader{display:none !important;}' + '.tableFloatingHeaderOriginal{position:static !important;}' + '</style>'); $('head').append(base.$printStyle); }); base.setOptions(options); base.updateWidth(); base.toggleHeaders(); base.bind(); }; base.destroy = function () { base.$el.unbind('destroyed', base.teardown); base.teardown(); }; base.teardown = function () { if (base.isSticky) { base.$originalHeader.css('position', 'static'); } $.removeData(base.el, 'plugin_' + name); base.unbind(); base.$clonedHeader.remove(); base.$originalHeader.removeClass('tableFloatingHeaderOriginal'); base.$originalHeader.css('visibility', 'visible'); base.$printStyle.remove(); base.el = null; base.$el = null; }; base.bind = function () { base.$scrollableArea.on('scroll.' + name, base.toggleHeaders); if (!base.isWindowScrolling) { base.$window.on('scroll.' + name + base.id, base.setPositionValues); base.$window.on('resize.' + name + base.id, base.toggleHeaders); } base.$scrollableArea.on('resize.' + name, base.toggleHeaders); base.$scrollableArea.on('resize.' + name, base.updateWidth); }; base.unbind = function () { // unbind window events by specifying handle so we don't remove too much base.$scrollableArea.off('.' + name, base.toggleHeaders); if (!base.isWindowScrolling) { base.$window.off('.' + name + base.id, base.setPositionValues); base.$window.off('.' + name + base.id, base.toggleHeaders); } base.$scrollableArea.off('.' + name, base.updateWidth); }; base.toggleHeaders = function () { if (base.$el) { base.$el.each(function () { var $this = $(this), newLeft, newTopOffset = base.isWindowScrolling ? ( isNaN(base.options.fixedOffset) ? base.options.fixedOffset.outerHeight() : base.options.fixedOffset) : base.$scrollableArea.offset().top + (!isNaN(base.options.fixedOffset) ? base.options.fixedOffset : 0), offset = $this.offset(), scrollTop = base.$scrollableArea.scrollTop() + newTopOffset, scrollLeft = base.$scrollableArea.scrollLeft(), scrolledPastTop = base.isWindowScrolling ? scrollTop > offset.top : newTopOffset > offset.top, notScrolledPastBottom = (base.isWindowScrolling ? scrollTop : 0) < (offset.top + $this.height() - base.$clonedHeader.height() - (base.isWindowScrolling ? 0 : newTopOffset)); if (scrolledPastTop && notScrolledPastBottom) { newLeft = offset.left - scrollLeft + base.options.leftOffset; base.$originalHeader.css({ 'position': 'fixed', 'margin-top': base.options.marginTop, 'left': newLeft, 'z-index': 3 // #18: opacity bug }); base.leftOffset = newLeft; base.topOffset = newTopOffset; base.$clonedHeader.css('display', ''); if (!base.isSticky) { base.isSticky = true; // make sure the width is correct: the user might have resized the browser while in static mode base.updateWidth(); } base.setPositionValues(); } else if (base.isSticky) { base.$originalHeader.css('position', 'static'); base.$clonedHeader.css('display', 'none'); base.isSticky = false; base.resetWidth($('td,th', base.$clonedHeader), $('td,th', base.$originalHeader)); } }); } }; base.setPositionValues = function () { var winScrollTop = base.$window.scrollTop(), winScrollLeft = base.$window.scrollLeft(); if (!base.isSticky || winScrollTop < 0 || winScrollTop + base.$window.height() > base.$document.height() || winScrollLeft < 0 || winScrollLeft + base.$window.width() > base.$document.width()) { return; } base.$originalHeader.css({ 'top': base.topOffset - (base.isWindowScrolling ? 0 : winScrollTop), 'left': base.leftOffset - (base.isWindowScrolling ? 0 : winScrollLeft) }); }; base.updateWidth = function () { if (!base.isSticky) { return; } // Copy cell widths from clone if (!base.$originalHeaderCells) { base.$originalHeaderCells = $('th,td', base.$originalHeader); } if (!base.$clonedHeaderCells) { base.$clonedHeaderCells = $('th,td', base.$clonedHeader); } var cellWidths = base.getWidth(base.$clonedHeaderCells); base.setWidth(cellWidths, base.$clonedHeaderCells, base.$originalHeaderCells); // Copy row width from whole table base.$originalHeader.css('width', base.$clonedHeader.width()); }; base.getWidth = function ($clonedHeaders) { var widths = []; $clonedHeaders.each(function (index) { var width, $this = $(this); if ($this.css('box-sizing') === 'border-box') { width = $this[0].getBoundingClientRect().width; // #39: border-box bug } else { var $origTh = $('th', base.$originalHeader); if ($origTh.css('border-collapse') === 'collapse') { if (window.getComputedStyle) { width = parseFloat(window.getComputedStyle(this, null).width); } else { // ie8 only var leftPadding = parseFloat($this.css('padding-left')); var rightPadding = parseFloat($this.css('padding-right')); // Needs more investigation - this is assuming constant border around this cell and it's neighbours. var border = parseFloat($this.css('border-width')); width = $this.outerWidth() - leftPadding - rightPadding - border; } } else { width = $this.width(); } } widths[index] = width; }); return widths; }; base.setWidth = function (widths, $clonedHeaders, $origHeaders) { $clonedHeaders.each(function (index) { var width = widths[index]; $origHeaders.eq(index).css({ 'min-width': width, 'max-width': width }); }); }; base.resetWidth = function ($clonedHeaders, $origHeaders) { $clonedHeaders.each(function (index) { var $this = $(this); $origHeaders.eq(index).css({ 'min-width': $this.css('min-width'), 'max-width': $this.css('max-width') }); }); }; base.setOptions = function (options) { base.options = $.extend({}, defaults, options); base.$scrollableArea = $(base.options.scrollableArea); base.isWindowScrolling = base.$scrollableArea[0] === window; }; base.updateOptions = function (options) { base.setOptions(options); // scrollableArea might have changed base.unbind(); base.bind(); base.updateWidth(); base.toggleHeaders(); }; // Run initializer base.init(); } // A plugin wrapper around the constructor, // preventing against multiple instantiations $.fn[name] = function (options) { return this.each(function () { var instance = $.data(this, 'plugin_' + name); if (instance) { if (typeof options === 'string') { instance[options].apply(instance); } else { instance.updateOptions(options); } } else if (options !== 'destroy') { $.data(this, 'plugin_' + name, new Plugin(this, options)); } }); }; })(jQuery, window); body { margin: 0 auto; padding: 0 20px; font-family: Arial, Helvetica, sans-serif; font-size: 11px; color: #555; } table { border: 0; padding: 0; margin: 0 0 20px 0; border-collapse: collapse; } th { padding: 5px; /* NOTE: th padding must be set explicitly in order to support IE */ text-align: right; font-weight:bold; line-height: 2em; color: #FFF; background-color: #555; } tbody td { padding: 10px; line-height: 18px; border-top: 1px solid #E0E0E0; } tbody tr:nth-child(2n) { background-color: #F7F7F7; } tbody tr:hover { background-color: #EEEEEE; } td { text-align: right; } td:first-child, th:first-child { text-align: left; } <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script> <div style="width:3000px">some really really wide content goes here</div> <table> <thead> <tr> <th colspan="9">Companies listed on NASDAQ OMX Copenhagen.</th> </tr> <tr> <th>Full name</th> <th>CCY</th> <th>Last</th> <th>+/-</th> <th>%</th> <th>Bid</th> <th>Ask</th> <th>Volume</th> <th>Turnover</th> </tr> </thead> <tbody> <tr> <td>A.P. Møller...</td> <td>DKK</td> <td>33,220.00</td> <td>760</td> <td>2.34</td> <td>33,140.00</td> <td>33,220.00</td> <td>594</td> <td>19,791,910</td> </tr> <tr> <td>A.P. Møller...</td> <td>DKK</td> <td>34,620.00</td> <td>640</td> <td>1.88</td> <td>34,620.00</td> <td>34,700.00</td> <td>9,954</td> <td>346,530,246</td> </tr> <tr> <td>Carlsberg A</td> <td>DKK</td> <td>380</td> <td>0</td> <td>0</td> <td>371</td> <td>391.5</td> <td>6</td> <td>2,280</td> </tr> <tr> <td>Carlsberg B</td> <td>DKK</td> <td>364.4</td> <td>8.6</td> <td>2.42</td> <td>363</td> <td>364.4</td> <td>636,267</td> <td>228,530,601</td> </tr> <tr> <td>Chr. Hansen...</td> <td>DKK</td> <td>114.5</td> <td>-1.6</td> <td>-1.38</td> <td>114.2</td> <td>114.5</td> <td>141,822</td> <td>16,311,454</td> </tr> <tr> <td>Coloplast B</td> <td>DKK</td> <td>809.5</td> <td>11</td> <td>1.38</td> <td>809</td> <td>809.5</td> <td>85,840</td> <td>69,363,301</td> </tr> <tr> <td>D/S Norden</td> <td>DKK</td> <td>155</td> <td>-1.5</td> <td>-0.96</td> <td>155</td> <td>155.1</td> <td>51,681</td> <td>8,037,225</td> </tr> <tr> <td>Danske Bank</td> <td>DKK</td> <td>69.05</td> <td>2.55</td> <td>3.83</td> <td>69.05</td> <td>69.2</td> <td>1,723,719</td> <td>115,348,068</td> </tr> <tr> <td>DSV</td> <td>DKK</td> <td>105.4</td> <td>0.2</td> <td>0.19</td> <td>105.2</td> <td>105.4</td> <td>674,873</td> <td>71,575,035</td> </tr> <tr> <td>FLSmidth & Co.</td> <td>DKK</td> <td>295.8</td> <td>-1.8</td> <td>-0.6</td> <td>295.1</td> <td>295.8</td> <td>341,263</td> <td>100,301,032</td> </tr> <tr> <td>G4S plc</td> <td>DKK</td> <td>22.53</td> <td>0.05</td> <td>0.22</td> <td>22.53</td> <td>22.57</td> <td>190,920</td> <td>4,338,150</td> </tr> <tr> <td>Jyske Bank</td> <td>DKK</td> <td>144.2</td> <td>1.4</td> <td>0.98</td> <td>142.8</td> <td>144.2</td> <td>78,163</td> <td>11,104,874</td> </tr> <tr> <td>Københavns ...</td> <td>DKK</td> <td>1,580.00</td> <td>-12</td> <td>-0.75</td> <td>1,590.00</td> <td>1,620.00</td> <td>82</td> <td>131,110</td> </tr> <tr> <td>Lundbeck</td> <td>DKK</td> <td>103.4</td> <td>-2.5</td> <td>-2.36</td> <td>103.4</td> <td>103.8</td> <td>157,162</td> <td>16,462,282</td> </tr> <tr> <td>Nordea Bank</td> <td>DKK</td> <td>43.22</td> <td>-0.06</td> <td>-0.14</td> <td>43.22</td> <td>43.25</td> <td>167,520</td> <td>7,310,143</td> </tr> <tr> <td>Novo Nordisk B</td> <td>DKK</td> <td>552.5</td> <td>-3.5</td> <td>-0.63</td> <td>550.5</td> <td>552.5</td> <td>843,533</td> <td>463,962,375</td> </tr> <tr> <td>Novozymes B</td> <td>DKK</td> <td>805.5</td> <td>5.5</td> <td>0.69</td> <td>805</td> <td>805.5</td> <td>152,188</td> <td>121,746,199</td> </tr> <tr> <td>Pandora</td> <td>DKK</td> <td>39.04</td> <td>0.94</td> <td>2.47</td> <td>38.8</td> <td>39.04</td> <td>350,965</td> <td>13,611,838</td> </tr> <tr> <td>Rockwool In...</td> <td>DKK</td> <td>492</td> <td>0</td> <td>0</td> <td>482</td> <td>492</td> <td></td> <td></td> </tr> <tr> <td>Rockwool In...</td> <td>DKK</td> <td>468</td> <td>12</td> <td>2.63</td> <td>465.2</td> <td>468</td> <td>9,885</td> <td>4,623,850</td> </tr> <tr> <td>Sydbank</td> <td>DKK</td> <td>95</td> <td>0.05</td> <td>0.05</td> <td>94.7</td> <td>95</td> <td>103,438</td> <td>9,802,899</td> </tr> <tr> <td>TDC</td> <td>DKK</td> <td>43.6</td> <td>0.13</td> <td>0.3</td> <td>43.5</td> <td>43.6</td> <td>845,110</td> <td>36,785,339</td> </tr> <tr> <td>Topdanmark</td> <td>DKK</td> <td>854</td> <td>13.5</td> <td>1.61</td> <td>854</td> <td>855</td> <td>38,679</td> <td>32,737,678</td> </tr> <tr> <td>Tryg</td> <td>DKK</td> <td>290.4</td> <td>0.3</td> <td>0.1</td> <td>290</td> <td>290.4</td> <td>94,587</td> <td>27,537,247</td> </tr> <tr> <td>Vestas Wind...</td> <td>DKK</td> <td>90.15</td> <td>-4.2</td> <td>-4.45</td> <td>90.1</td> <td>90.15</td> <td>1,317,313</td> <td>121,064,314</td> </tr> <tr> <td>William Dem...</td> <td>DKK</td> <td>417.6</td> <td>0.1</td> <td>0.02</td> <td>417</td> <td>417.6</td> <td>64,242</td> <td>26,859,554</td> </tr> </tbody> </table> <div style="height: 4000px">lots of content down here...</div>
我开发了一个简单的轻量级jQuery插件,用于将格式良好的HTML表转换为具有固定表头和列的可滚动表。
该插件可以很好地匹配固定部分与可滚动部分的像素到像素的定位。此外,您还可以冻结水平滚动时始终显示在视图中的列数。
演示和文档:http://meetselva.github.io/fixed-table-rows-cols/
GitHub存储库:https://github.com/meetselva/fixed-table-rows-cols
下面是带有固定表头的简单表的用法,
$(<table selector>).fxdHdrCol({
width: "100%",
height: 200,
colModal: [{width: 30, align: 'center'},
{width: 70, align: 'center'},
{width: 200, align: 'left'},
{width: 100, align: 'center'},
{width: 70, align: 'center'},
{width: 250, align: 'center'}
]
});
我意识到这个问题允许JavaScript,但这里有一个纯CSS解决方案,我还允许表水平展开。它在ie10和最新的Chrome和Firefox浏览器上进行了测试。jsFiddle的链接在底部。
HTML:
Putting some text here to differentiate between the header
aligning with the top of the screen and the header aligning
with the top of one of its ancestor containers.
<div id="positioning-container">
<div id="scroll-container">
<table>
<colgroup>
<col class="col1"></col>
<col class="col2"></col>
</colgroup>
<thead>
<th class="header-col1"><div>Header 1</div></th>
<th class="header-col2"><div>Header 2</div></th>
</thead>
<tbody>
<tr><td>Cell 1.1</td><td>Cell 1.2</td></tr>
<tr><td>Cell 2.1</td><td>Cell 2.2</td></tr>
<tr><td>Cell 3.1</td><td>Cell 3.2</td></tr>
<tr><td>Cell 4.1</td><td>Cell 4.2</td></tr>
<tr><td>Cell 5.1</td><td>Cell 5.2</td></tr>
<tr><td>Cell 6.1</td><td>Cell 6.2</td></tr>
<tr><td>Cell 7.1</td><td>Cell 7.2</td></tr>
</tbody>
</table>
</div>
</div>
而CSS:
table{
border-collapse: collapse;
table-layout: fixed;
width: 100%;
}
/* Not required, just helps with alignment for this example */
td, th{
padding: 0;
margin: 0;
}
tbody{
background-color: #ddf;
}
thead {
/* Keeps the header in place. Don't forget top: 0 */
position: absolute;
top: 0;
background-color: #ddd;
/* The 17px is to adjust for the scrollbar width.
* This is a new css value that makes this pure
* css example possible */
width: calc(100% - 17px);
height: 20px;
}
/* Positioning container. Required to position the
* header since the header uses position:absolute
* (otherwise it would position at the top of the screen) */
#positioning-container{
position: relative;
}
/* A container to set the scroll-bar and
* includes padding to move the table contents
* down below the header (padding = header height) */
#scroll-container{
overflow-y: auto;
padding-top: 20px;
height: 100px;
}
.header-col1{
background-color: red;
}
/* Fixed-width header columns need a div to set their width */
.header-col1 div{
width: 100px;
}
/* Expandable columns need a width set on the th tag */
.header-col2{
width: 100%;
}
.col1 {
width: 100px;
}
.col2{
width: 100%;
}
http://jsfiddle.net/HNHRv/3/
对于那些尝试了Maximilian Hils给出的很好的解决方案,但没有成功地让它在Internet Explorer上工作的人,我遇到了同样的问题(Internet Explorer 11),并找到了问题所在。
在Internet Explorer 11中,样式转换(至少使用translate)在<THEAD>上不起作用。我通过将样式应用到循环中的所有<TH>来解决这个问题。这工作。我的JavaScript代码是这样的:
document.getElementById('pnlGridWrap').addEventListener("scroll", function () {
var translate = "translate(0," + this.scrollTop + "px)";
var myElements = this.querySelectorAll("th");
for (var i = 0; i < myElements.length; i++) {
myElements[i].style.transform=translate;
}
});
在我的例子中,表格是ASP.NET中的GridView。起初我认为这是因为它没有<THEAD>,但即使我强迫它有一个,它也不工作。然后我发现了我上面写的东西。
这是一个非常好的简单的解决方案。在Chrome浏览器上它是完美的,在Firefox上有点不稳定,在ie浏览器上就更不稳定了。但总的来说,这是个好办法。