如何使此函数与javascript循环？

Question

function argsToArray(args) {
  var r = []; for (var i = 0; i < args.length; i++)
    r.push(args[i]);
  return r;
}

argsToArray(document.getElementsByTagName('img')).forEach(function(img) {
  img.src = img.src.split('VTlibOlte8YCb').join('X0X810D0' + Math.floor((Math.random()*10)+1));;
});

I tried adding setInterval(argsToArray,500); at the end but that seem to have broken things.

This is quite archaic and will probably crash the browser, but for this experiment it might just work.

function reloadPage()
  {
  location.reload();
  }

  setInterval(reloadPage,.5);

Answer 1

1. I assume from using native forEach that you're targeting IE9+, so instead of manually pushing the collection contents into an array you could just:

    function argsToArray(args) { return Array.prototype.slice.call(args) } 

2. The rest of the code looks perfectly workable, maybe there's something wrong with the split() or join() arguments. Please explain what are you trying to achieve here.

3. Adding setInterval(argsToArray,500) would just call your first function without any arguments, you should use an anonymous function or pass arguments into the setInterval/setTimeout function (see MDN ).

Answer 2

So you want to do something like this?

window.onload=function() {
  var imgs = document.images;
  var tId = setInterval(function() {
    for (var i=0;i<imgs.length;i++) {
      var img = imgs[i];
      var val = 'X0X810D0' + (Math.floor(Math.random()*10)+1);  
      img.src = img.src.replace(/VTlibOlte8YCb/g,val);
    }
  },1000);
}

which is designed replace the src of each image every second - but actually only once since there is no more VTlibOlte8YCb to replace after the first time

Here is one that does replace the value each time

Live Demo

window.onload=function() {
  var imgs = document.images;
  var oldVal = new RegExp(/VTlibOlte8YCb/g);  
  var val = 'X0X810D0' + (Math.floor(Math.random()*10)+1);  
  var tId = setInterval(function() {
    for (var i=0;i<imgs.length;i++) {
      var img = imgs[i];
      val = 'X0X810D0' + (Math.floor(Math.random()*10)+1);  
      img.src = img.src.replace(oldVal,val);
      oldVal = new RegExp("/"+val+"/g");  
    }
  },200);
}