Internet explorer 为什么'；这个梯度在IE9上不起作用吗？

CSS:

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为什么IE版本的gradient不起作用？我好像找不到哪里不对劲

尝试设置GradientType属性：

 background-image: linear-gradient(bottom, #000000 29%, #999999 65%);
    background-image: -o-linear-gradient(bottom, #000000 29%, #999999 65%);
    background-image: -moz-linear-gradient(bottom, #000000 29%, #999999 65%);
    background-image: -webkit-linear-gradient(bottom, #000000 29%, #999999 65%);
    background-image: -ms-linear-gradient(bottom, #000000 29%, #999999 65%);
    background-image: -webkit-gradient(linear,  left bottom,    left top,   color-stop(0.29, #000000),  color-stop(0.65, #999999));
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#000000', endColorstr='#999999');

试一试

filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#000000', endColorstr='#999999', GradientType=0);

filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#000000', endColorstr='#999999',GradientType=0 ); /* IE6-9 *

background: -ms-linear-gradient(top, rgba(0,0,0,1) 0%,rgba(153,153,153,1) 100%); /* IE10+ */