function getFirstImageSrcFromHtml(htmlStr) {
    const imgReg = /<img.*?(?:>|\/>)/gi;
    const srcReg = /src=[\'\"]?([^\'\"]*)[\'\"]?/i;
    let arr = htmlStr.match(imgReg);
    if (arr && arr.length) {
        let srcArr = arr[0].match(srcReg);
        if (srcArr && srcArr.length) {
            return srcArr[srcArr.length - 1];
        } else {
            return ""
        }
    } else {
        return "";
    }
}