google，百度了半天，也尝试修改了很多地方的class,background-color，但是毫无结果。
最后用firedebug发现除了background-color之外，还有其它几个属性：
background-image:
background-image:
background-image:
background-image:
background-image:
background-image:
background-repeat
在stack overflow找到了解决办法。
在css下新建style.css，并覆写bootstrap的.navbar-inner属性:
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.navbar-inner {
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background-color:#f58220;
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/* Gradients for modern browsers, replace as you see fit */
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background-image: -moz-linear-gradient(top, #f58220, #fedcbd);
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background-image: -ms-linear-gradient(top, #f58220, #fedcbd);
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background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#f58220), to(#fedcbd));
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background-image: -webkit-linear-gradient(top, #f58220, #fedcbd);
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background-image: -o-linear-gradient(top, #f58220, #fedcbd);
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background-image: linear-gradient(top, #f58220, #fedcbd);
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background-repeat: repeat-x;
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/* IE8-9 gradient filter */
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filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=’#333333′, endColorstr=’#fedcbd’, GradientType=0);
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