为什么一段时间后我的窗户不会关闭？ （JavaScript）

Question

I can't figure out why the window won't close after 86 seconds.

Here's the code:

//Functions 
function URL() {
    return prompt("Enter the URL."); 
} 

function openNewWindow() { 
    var url = URL(); 
    popupWin = window.open(url, 'open_window', 'menubar, toolbar, location, directories, status, scrollbars, resizable,dependent, width=640, height=480, left=0, top=0');
    setTimeout(url,86000); 
} 

//Main
var url1 = openNewWindow(); 

Answer 1

One problem is that the code is not passing a function to setTimeout , but just a string read via prompt . (While setTimeout will accept a string, for legacy reasons, it must be valid JavaScript code to make any sense.)

function URL() {
    return prompt("Enter the URL."); 
} 

function openNewWindow() { 
    var url = URL();   // url is the RETURN VALUE of calling the URL function ..
    popupWin = window.open(url, 'open_window', 'menubar, toolbar, location, directories, status, scrollbars, resizable,dependent, width=640, height=480, left=0, top=0');
    // .. which is a string (representing a URL), not a function
    setTimeout(url,86000); 
} 

Compare with:

function openNewWindow() { 
    var url = URL();   // url is the RETURN VALUE of calling the URL function ..
    var popupWin = window.open(url, 'open_window', 'menubar, toolbar, location, directories, status, scrollbars, resizable,dependent, width=640, height=480, left=0, top=0');
    // .. but we pass a callback function :)
    setTimeout(function () {
        alert("done");
        // And assuming the browser allows this ..
        popupWin.close();
    }, 4 * 1000);
} 

(Note that I've also made popupWin a var so that it is caught in the closure - thus all the opened windows should be closed after their respective timeout, not just the last one.)

Answer 2

No where in that code does window.close() get called.

setTimeout(url, 86000) just schedules the execution of the function url() in about 24 hours.