750rpx在iphone6上正常 android机上显示有问题

左边和右边预留的都为30rpx 但渲染出来 左边14px 右边17px 相差3px

<view class="intro">

    <view class='td'></view>

    <view class='td'></view>

    <view class='td'></view>

    <view class='td'></view>

    <view class='td'></view>

    <view class='td'></view>

</view>

.td { float: left; width: 335rpx; height: 300rpx; margin: 20rpx 0 0 20rpx; background: gray; }

.td:nth-of-type(2n+1) { margin-left: 30rpx; }

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