css - 用于渐变的 IE9 背景大小

Question

有没有办法为 IE9 使用 background-size 作为 gradients？因为在我的例子中，将 background-size 添加到 CSS 没有任何效果。

[更新]

示例代码:

-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#ccc', endColorstr='#ddd')";
background-size: 2px 100%;

在这种情况下，背景大小不起作用。

Answer 1

background-size 在 IE9 中不适用于渐变。仅适用于图像。这就是解决方案使用 SVG 的原因。

我在一些网站上找到了一个解决方案，并稍微改变它以支持 RGBA (SASS)即使对于 IE9(webkit 除外)也能正常工作:

@mixin svg-linear-gradient($angle, $color1, $color1Alpha, $offset1, $color2, $color2Alpha, $offset2:100, $color3:null, $color3Alpha: 1, $offset3:100, $color4:null, $color4Alpha: 1, $offset4:100, $color5:null, $color5Alpha:1, $offset5:100){
    $angle_webkit:'left top, left bottom';
    $angle_svg:'%20x2%3d%220%25%22%20y2%3d%22100%25%22';
    $color-stop1_svg:'%3cstop%20style%3d%22stop%2dcolor%3argba('#{red($color1)}'%2C'#{green($color1)}'%2C'#{blue($color1)}'%2C'#{$color1Alpha}')%22%20offset%3d%22'#{$offset1}'%25%22%2f%3e';
    $color-stop2_svg:'%3cstop%20style%3d%22stop%2dcolor%3argba('#{red($color2)}'%2C'#{green($color2)}'%2C'#{blue($color2)}'%2C'#{$color2Alpha}')%22%20offset%3d%22'#{$offset2}'%25%22%2f%3e';
    $color-stop3_svg:'';
    $color-stop4_svg:'';
    $color-stop5_svg:'';
    @if $angle == right{
         $angle_svg:'%20x2%3d%22100%25%22';
     }
    @if $angle == bottom{
         $angle_svg:'%20x2%3d%220%22%20y1%3d%22100%25%22';
     }
    @if $angle == left{
         $angle_svg:'';
     }
    @if $color3 != null {
         $color-stop3_svg:'%3cstop%20style%3d%22stop%2dcolor%3argba('#{red($color3)}'%2C'#{green($color3)}'%2C'#{blue($color3)}'%2C'#{$color3Alpha}')%22%20offset%3d%22'#{$offset3}'%25%22%2f%3e';
     }
    @if $color4 != null {
         $color-stop4_svg:'%3cstop%20style%3d%22stop%2dcolor%3argba('#{red($color4)}'%2C'#{green($color4)}'%2C'#{blue($color4)}'%2C'#{$color4Alpha}')%22%20offset%3d%22'#{$offset4}'%25%22%2f%3e';
     }
    @if $color5 != null {
         $color-stop5_svg:'%3cstop%20style%3d%22stop%2dcolor%3argba('#{red($color5)}'%2C'#{green($color5)}'%2C'#{blue($color5)}'%2C'#{$color5Alpha}')%22%20offset%3d%22'#{$offset5}'%25%22%2f%3e';
     }

    background: url('data:image/svg+xml,%3csvg%20xmlns%3d%22http%3a%2f%2fwww%2ew3%2eorg%2f2000%2fsvg%22%20width%3d%22100%25%22%20height%3d%22100%25%22%3e%3cdefs%3e%3clinearGradient%20id%3d%22G%22#{$angle_svg}%3e#{$color-stop1_svg}#{$color-stop2_svg}#{$color-stop3_svg}#{$color-stop4_svg}#{$color-stop5_svg}%3c%2flinearGradient%3e%3c%2fdefs%3e%3crect%20width%3d%22100%25%22%20height%3d%22100%25%22%20fill%3d%22url%28%23G%29%22%2f%3e%3c%2fsvg%3e');
}

以及如何使用它:

@include svg-linear-gradient(top, $first, $firstAlpha, 0, $second, $secondAlpha, 100);