原理是使用css3的渐变背景，再将高设为分割线的高度
<!DOCTYPE html><html><head><style>.title{ position:relative; text-align:center;}.title:before, .title:after { content: ""; width: 40%; height: 1px; position: absolute; top: 50%; }.title:before { background: -webkit-linear-gradient(right, #666 , #eee); background: -o-linear-gradient(left, #666 , #eee); background: -moz-linear-gradient(left,#666 , #eee); background: linear-gradient(to left, #666 , #eee); left: 2px;}.title:after { background: -webkit-linear-gradient(left, #666 , #eee); background: -o-linear-gradient(right, #666 , #eee); background: -moz-linear-gradient(right,#666 , #eee); background: linear-gradient(to right, #666 , #eee); right: 2px;}</style></head><body><p class="title">这是一个标题</p></body></html>效果图：
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