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因此在 variables.less 中定义了 Bootstrap 按钮颜色：

@btnPrimaryBackground:              @linkColor;
@btnPrimaryBackgroundHighlight:     spin(@btnPrimaryBackground, 20%);

@btnInfoBackground:                 #5bc0de;
@btnInfoBackgroundHighlight:        #2f96b4;

@btnSuccessBackground:              #62c462;
@btnSuccessBackgroundHighlight:     #51a351;

@btnWarningBackground:              lighten(@orange, 15%);
@btnWarningBackgroundHighlight:     @orange;

@btnDangerBackground:               #ee5f5b;
@btnDangerBackgroundHighlight:      #bd362f;

@btnInverseBackground:              #444;
@btnInverseBackgroundHighlight:     @grayDarker;

背景和backgroundHighlight的十六进制代码中是否存在一些逻辑（即十六进制代码之间的特定颜色差异），或者它们是否是根据某人“看起来不错”的设计观点任意设置的？

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2 回答 2

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您可以看到它是专门设计的。但是您可以使用具有 5% 或 10% 值的 lighten() 或 darken() mixins 来设置高光。但是同样的方式你可以用一种颜色制作整个按钮:)

于 2012-12-16T21:43:58.460 回答
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我从 Bootstrap 的源代码中获取了相关的 LESS 代码来生成一个btn-purple类。渐变等与默认按钮非常相似。您只需要更改@backgroundColor并@backgroundColorHighlight在下面的 LESS 代码中更改颜色。

// Gradient Bar Colors for buttons and alerts
.gradientBar(@primaryColor, @secondaryColor, @textColor: #fff, @textShadow: 0 -1px 0 rgba(0,0,0,.25)) {
    color: @textColor;
    text-shadow: @textShadow;
    #gradient > .vertical(@primaryColor, @secondaryColor);
    border-color: @secondaryColor @secondaryColor darken(@secondaryColor, 15%);
    border-color: rgba(0,0,0,.1) rgba(0,0,0,.1) fadein(rgba(0,0,0,.1), 15%);
}

// Gradients
#gradient {
    .horizontal(@startColor: #555, @endColor: #333) {
        background-color: @endColor;
        background-image: -moz-linear-gradient(left, @startColor, @endColor); // FF 3.6+
        background-image: -webkit-gradient(linear, 0 0, 100% 0, from(@startColor), to(@endColor)); // Safari 4+, Chrome 2+
        background-image: -webkit-linear-gradient(left, @startColor, @endColor); // Safari 5.1+, Chrome 10+
        background-image: -o-linear-gradient(left, @startColor, @endColor); // Opera 11.10
        background-image: linear-gradient(to right, @startColor, @endColor); // Standard, IE10
        background-repeat: repeat-x;
        filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",argb(@startColor),argb(@endColor))); // IE9 and down
    }
    .vertical(@startColor: #555, @endColor: #333) {
        background-color: mix(@startColor, @endColor, 60%);
        background-image: -moz-linear-gradient(top, @startColor, @endColor); // FF 3.6+
        background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), to(@endColor)); // Safari 4+, Chrome 2+
        background-image: -webkit-linear-gradient(top, @startColor, @endColor); // Safari 5.1+, Chrome 10+
        background-image: -o-linear-gradient(top, @startColor, @endColor); // Opera 11.10
        background-image: linear-gradient(to bottom, @startColor, @endColor); // Standard, IE10
        background-repeat: repeat-x;
        filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down
    }
    .directional(@startColor: #555, @endColor: #333, @deg: 45deg) {
        background-color: @endColor;
        background-repeat: repeat-x;
        background-image: -moz-linear-gradient(@deg, @startColor, @endColor); // FF 3.6+
        background-image: -webkit-linear-gradient(@deg, @startColor, @endColor); // Safari 5.1+, Chrome 10+
        background-image: -o-linear-gradient(@deg, @startColor, @endColor); // Opera 11.10
        background-image: linear-gradient(@deg, @startColor, @endColor); // Standard, IE10
    }
    .horizontal-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
        background-color: mix(@midColor, @endColor, 80%);
        background-image: -webkit-gradient(left, linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
        background-image: -webkit-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
        background-image: -moz-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
        background-image: -o-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
        background-image: linear-gradient(to right, @startColor, @midColor @colorStop, @endColor);
        background-repeat: no-repeat;
        filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
    }

    .vertical-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
        background-color: mix(@midColor, @endColor, 80%);
        background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
        background-image: -webkit-linear-gradient(@startColor, @midColor @colorStop, @endColor);
        background-image: -moz-linear-gradient(top, @startColor, @midColor @colorStop, @endColor);
        background-image: -o-linear-gradient(@startColor, @midColor @colorStop, @endColor);
        background-image: linear-gradient(@startColor, @midColor @colorStop, @endColor);
        background-repeat: no-repeat;
        filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
    }
    .radial(@innerColor: #555, @outerColor: #333) {
        background-color: @outerColor;
        background-image: -webkit-gradient(radial, center center, 0, center center, 460, from(@innerColor), to(@outerColor));
        background-image: -webkit-radial-gradient(circle, @innerColor, @outerColor);
        background-image: -moz-radial-gradient(circle, @innerColor, @outerColor);
        background-image: -o-radial-gradient(circle, @innerColor, @outerColor);
        background-repeat: no-repeat;
    }
    .striped(@color: #555, @angle: 45deg) {
        background-color: @color;
        background-image: -webkit-gradient(linear, 0 100%, 100% 0, color-stop(.25, rgba(255,255,255,.15)), color-stop(.25, transparent), color-stop(.5, transparent), color-stop(.5, rgba(255,255,255,.15)), color-stop(.75, rgba(255,255,255,.15)), color-stop(.75, transparent), to(transparent));
        background-image: -webkit-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
        background-image: -moz-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
        background-image: -o-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
        background-image: linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
    }
}
// Reset filters for IE
.reset-filter() {
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(enabled = false)"));
}

.buttonBackground(@startColor, @endColor, @textColor: #fff, @textShadow: 0 -1px 0 rgba(0,0,0,.25)) {
    // gradientBar will set the background to a pleasing blend of these, to support IE<=9
    .gradientBar(@startColor, @endColor, @textColor, @textShadow);
    *background-color: @endColor; /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    .reset-filter();

      // in these cases the gradient won't cover the background, so we override
    &:hover, &:focus, &:active, &.active, &.disabled, &[disabled] {
        color: @textColor;
        background-color: @endColor;
        *background-color: darken(@endColor, 5%);
        background-position: 0 -15px;
    }

    // IE 7 + 8 can't handle box-shadow to show active, so we darken a bit ourselves
    &:active,
    &.active {
        background-color: darken(@endColor, 10%) e("\9");
    }
}

// Provide *some* extra contrast for those who can get it
.btn-purple.active {
    color: rgba(255,255,255,.75);
}

// Set the backgrounds
// -------------------------
@backgroundColor: lighten(#7a43b6, 10%);
@backgroundColorHighlight: darken(#7a43b6, 5%);
.btn-purple {
    .buttonBackground(@backgroundColor, @backgroundColorHighlight);
}
于 2013-05-26T23:44:01.747 回答