let cahce: null | boolean = null
/**
 * 判断是否支持 WebP
 */
export function isSupportWebP(): boolean {
    if (cahce !== null) return cahce

    try {
        if ((<any>window).chrome) {
            return true
        } else {
            return check()
        }
    } catch (e) {
        console.error("isSupportWebP", e)
        return false
    }
}

function check(): boolean {
    if (cahce !== null) return cahce
    cahce = document.createElement("canvas").toDataURL("image/webp").indexOf("data:image/webp") == 0
    return cahce
}