判斷IE10加載某個class

@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
.blur {
opacity:.2;
filter:progid:DXImageTransform.Microsoft.Alpha(Opacity=20);
}
}
IE10有個-ms-high-contrast這樣的屬性，判斷有這個屬性就是IE10