利用javascript判断文件是否存在及window.open()404的解决

1

2

3

4

5

6

7

var fso,s=filespec;   // filespec="C:/path/myfile.txt"

fso=new ActiveXObject("Scripting.FileSystemObject");

if(fso.FileExists(filespec))

    s+=" exists.";

else

    s+=" doesn't exist.";

alert(s);

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

var xmlhttp;   

if(window.XMLHttpRequest)   

{   

    xmlhttp = new XMLHttpRequest();//其他浏览器   

}   

else if (window.ActiveXObject)

{   

    try {   

        xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");//旧版IE   

    }   

    catch (e) { }   

    try {   

        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");//新版IE   

    }   

    catch (e) { }   

    if (!xmlhttp) {   

        window.alert("不能创建XMLHttpRequest对象");   

    }   

}   

yourFileURL=xxxxxxx

xmlhttp.open("GET",yourFileURL,false); 

xmlhttp.send(); 

if(xmlhttp.readyState==4){    

    if(xmlhttp.status==200)  

        window.open(yourFileURL; )  //url存在  

    else

        alert("该视频名不存在"); //url不存在    

转载地址：https://www.cnblogs.com/remember-forget/p/9989787.html
说明资料ajax：https://blog.csdn.net/lijuhu/article/details/79210526
                        https://blog.csdn.net/txl199106/article/details/41654393
ActiveXObject("Scripting.FileSystemObject")：https://www.cnblogs.com/dingjiaoyang/p/5831059.html

                                                                              https://blog.csdn.net/qq_30337695/article/details/51788007
https://zhuanlan.zhihu.com/p/38773438