function support_webp() {
    var elem = document.createElement('canvas');
    if (!!(elem.getContext && elem.getContext('2d'))) {
        return elem.toDataURL('image/webp').indexOf('data:image/webp') == 0;
    } else {       
        return false;
    }
}

WebP测试-及webp jpg png之间的对比

http://local/10.complexmission.com/docs/webp-test/

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