它看起来像高度:100%的“链”被打破在div#main。试着增加高度:100%增加高度，这可能会让你更接近目标。

你可以使用jQuery来处理这个问题:

$(function() {
    /**
     * Read the size of the window and reposition the footer at the bottom.
     */
    var stickyFooter = function(){
        var pageHeight = $('html').height();
        var windowHeight = $(window).height();
        var footerHeight = $('footer').outerHeight();

        // A footer with 'fixed-bottom' has the CSS attribute "position: absolute",
        // and thus is outside of its container and counted in $('html').height().
        var totalHeight = $('footer').hasClass('fixed-bottom') ?
            pageHeight + footerHeight : pageHeight;

        // If the window is larger than the content, fix the footer at the bottom.
        if (windowHeight >= totalHeight) {
            return $('footer').addClass('fixed-bottom');
        } else {
            // If the page content is larger than the window, the footer must move.
            return $('footer').removeClass('fixed-bottom');
        }
    };

    // Call when this script is first loaded.
    window.onload = stickyFooter;

    // Call again when the window is resized.
    $(window).resize(function() {
        stickyFooter();
    });
});

一个工作的例子，Twitter引导不是黏脚

<script>
$(document).ready(function() {

    var docHeight = $(window).height();
    var footerHeight = $('#footer').height();
    var footerTop = $('#footer').position().top + footerHeight;

    if (footerTop < docHeight)
        $('#footer').css('margin-top', 10+ (docHeight - footerTop) + 'px');
});
</script>

在用户打开开发工具或调整大小窗口时总是更新的版本。

<script>
    $(document).ready(function() {
        setInterval(function() {
            var docHeight = $(window).height();
            var footerHeight = $('#footer').height();
            var footerTop = $('#footer').position().top + footerHeight;
            var marginTop = (docHeight - footerTop + 10);

            if (footerTop < docHeight)
                $('#footer').css('margin-top', marginTop + 'px'); // padding of 30 on footer
            else
                $('#footer').css('margin-top', '0px');
            // console.log("docheight: " + docHeight + "\n" + "footerheight: " + footerHeight + "\n" + "footertop: " + footerTop + "\n" + "new docheight: " + $(window).height() + "\n" + "margintop: " + marginTop);
        }, 250);
    });
</script>

您至少需要一个带有#footer的元素

当不需要滚动条时，如果内容适合屏幕，只需将10的值更改为0 如果内容不适合屏幕，滚动条将显示出来。

更简单的官方示例:http://getbootstrap.com/examples/sticky-footer-navbar/

html {
  position: relative;
  min-height: 100%;
}
body {
  margin-bottom: 60px;
}
.footer {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 60px;
  background-color: #f5f5f5;
}

HTML

<div id="wrapper">

  <div id="content">
    <!-- navbar and containers here -->
  </div>

  <div id="footer">
   <!-- your footer here -->
  </div>

</div>

CSS

html, body {
  height: 100%;
}

#wrapper {
  min-height: 100%;
  position: relative;
}

#content {
  padding-bottom: 100px; /* Height of the footer element */
}

#footer {
  width: 100%;
  height: 100px; /* Adjust to the footer needs */
  position: absolute;
  bottom: 0;
  left: 0;
}

它看起来像高度:100%的“链”被打破在div#main。试着增加高度:100%增加高度，这可能会让你更接近目标。