xhr xmlhttprequest无法在浏览器中使用？

Question

I am using a browser to send XMLHttpRequest to read a file on the server:

//Read Text File
var xhr = new XMLHttpRequest();
xhr.open("GET","http://...........read.txt",false);
xhr.send(null); 
var fileContent = xhr.responseText;

But I got

unknown error

network error

Any help is appreciated

Answer 1

check with status code condition like this:

    var xhr = new XMLHttpRequest();
xhr.open("GET","http://...........read.txt",false);
xhr.send(); 
console.log(xhr.responseText);

Answer 2

Remove false in xhr.open() function. Set onreadystatechange . You will get what you want!

 var xhr = new XMLHttpRequest(); xhr.open("GET","http://...........read.txt"); xhr.onreadystatechange = function () { if (this.readyState == 4 && this.status == 200) { console.log(xhr.responseText); } } xhr.send();