.ellipsis() {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ellipsis(@width) when (@width > 0px) {
    width: @width;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

// 各种渐变
.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;
}
.gradient-vertical(@startColor: #555, @endColor: #333) {
    background-color: @endColor;
    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: -moz-linear-gradient(top, @startColor, @endColor); // FF 3.6+
    background-image: linear-gradient(to bottom, @startColor, @endColor); // Standard, IE10
    background-repeat: repeat-x;
}
.gradient-directional(@startColor: #555, @endColor: #333, @deg: 45deg) {
    background-color: @endColor;
    background-repeat: repeat-x;
    background-image: -webkit-linear-gradient(@deg, @startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -moz-linear-gradient(@deg, @startColor, @endColor); // FF 3.6+
    background-image: linear-gradient(@deg, @startColor, @endColor); // Standard, IE10
}