.item:hover {
        zoom: 1;
        filter: alpha(opacity=50);
        opacity: 0.5;
        -webkit-transition: opacity .15s ease-in-out;
        -moz-transition: opacity .15s ease-in-out;
        -ms-transition: opacity .15s ease-in-out;
        -o-transition: opacity .15s ease-in-out;
        transition: opacity .15s ease-in-out;
    }

为什么当我将鼠标悬停在鼠标上时，为什么只在不透明度上设置动画？

此处的演示：http : //jsfiddle.net/7uR8z/

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