HTML：

'<div id="upload-btn"><span class="upload-btn-title">上傳文件</span><div class="upload-tip">支援pdf、word、ppt、excel、jpg等格式</div><div class="first-tip">支援中英日韓，不限字元翻譯，免費匯出</div></div>'

轉為普通文字：

"上傳文件支援pdf、word、ppt、excel、jpg等格式支援中英日韓，不限字元翻譯，免費匯出"

程式碼：

function
 
 filterHTML(html){
    let s = html.replace(/<\/?.+?>/g, ""),
        obj = {
            "&nbsp;": " ", "&lt;": "<", "&gt;": ">", "&amp;": "&",
            "&quot;": '"', "&apos;": "'", "&cent;": "￠", "&pound;": "￡",
            "&yen;": "￥", "&euro;": "€", "&sect;": "§", "&copy;": "©",
            
 
"&reg;": "®", "&trade;": "™", "&times;": "×", "&divide;": "÷"
        },
        reg = /(&nbsp;|&lt;|&gt;|&amp;|&quot;|&apos;|&cent;|&pound;|&yen;|&euro;|&sect;|&copy;|&reg;|&trade;|&times;|&divide)/g;
    
 
return s.replace(reg, function($){ return obj[$]; });
}

歡迎朋友們指出有所缺漏的地方