SOURCE

            
            var url="https://sf1-ttcdn-tos.pstatp.com/obj/temai/9649f28160a4873b097fe23316c66280fa330f2fw55";
             var url1="https://sf1-ttcdn-tos.pstatp.com/obj/temai/9649f28160a4873b097fe23316c66280fa330f2fwww800-800";
            debugger;
            // var result=CheckImgExists(url1).then(()=>{
            //    alert('true')
            // }).catch(()=>{
            //     alert('false')
            // });
            
           


// async function() {
//        var result=await isHasImg(url);
//              alert(result)
//       }
var result=ishttppritrue(url1);
alert(result)

            function ispritrue(){
            var Img = new Image;
            var ss=0;
            Img.onload = function()
            {
                alert(url + " 存在。");
                return true
               
            }
            Img.onerror = function()
            {
               alert(url + " 未找到，可能是网址错误，或不是一个图片文件。");
               return false
               
            }
            Img.src = url;
            }

            

            function ispritrue2(){
            var oReq = new ActiveXObject("Microsoft.xmlHTTP")
            oReq.open("Get","UploadFiles/2007829144941621.gif",false);
            oReq.send();
            //alert(oReq.status)
            if(oReq.status==404){
            alert('不存在');
            return false;
            }
            else{
            alert("存在")
            return true;
            }
}
function CheckImgExists(imgurl) {
        return new Promise(function(resolve, reject) {
          var ImgObj = new Image(); //判断图片是否存在
          ImgObj.src = imgurl;
          ImgObj.onload = function(res) {
            resolve(res);
          }
          ImgObj.onerror = function(err) {
            reject(err)
          }
        })
      }



 function isHasImg( src ){
    var img = new Image();
    img.src = src;
    img.onload = function(){
        if( img.width > 0 || img.height > 0  ){
           return true
        }
        else{
           return false
        }
    } 
     
    img.onerror = function(){
        return false
    }   
}
 
 
function onImgExistNotify(src,bExist,iPlace){//图片src是否存在通知
    if( bExist ){
        console.log("图片src="+src+"存在"+iPlace);
    }
    else{
        console.log("图片src="+src+"不存在"+iPlace);
    }
}



           
function ishttppritrue(src){
      const xhr = new XMLHttpRequest();
            debugger
            xhr.open('GET', src, false); // 同步的XMLHttpRequest请求
            xhr.send();
            xhr.response.encoding = 'gbk';
            debugger;
            if(xhr.status=='404') {
                return false;
            }
            else{
               return true;
            }
}

function gb2utf8(data){ 
    var glbEncode = []; 
    gb2utf8_data = data; 
    execScript("gb2utf8_data = MidB(gb2utf8_data, 1)", "VBScript"); 
    var t=escape(gb2utf8_data).replace(/%u/g,"").replace(/(.{2})(.{2})/g,"%$2%$1").replace(/%([A-Z].)%(.{2})/g,"@$1$2"); 
    t=t.split("@"); 
    var i=0,j=t.length,k; 
    while(++i<j) { 
        k=t[i].substring(0,4); 
        if(!glbEncode[k]) { 
            gb2utf8_char = eval("0x"+k); 
            execScript("gb2utf8_char = Chr(gb2utf8_char)", "VBScript"); 
            glbEncode[k]=escape(gb2utf8_char).substring(1,6); 
        } 
        t[i]=glbEncode[k]+t[i].substring(4); 
    } 
    gb2utf8_data = gb2utf8_char = null; 
    return unescape(t.join("%")); 
}