JavaScript：参数传递不适用于所有浏览器

Question

I'm trying to pass an argument to a function, which works fine on Chrome but not on all versions of Firefox. Here's the code :

  $('input').focus(function()
  {
     alert(this.width);
   });

this.width appears to be undefined on some versions of FF.

Please help me.

Answer 1

From your description, it seems the problem has nothing to do with passing an argument to a function, it's just that this.width is undefined in some browsers? I couldn't find documentation for width as a property of an input element, so it doesn't surprise me that it doesn't work consistently.

Have you tried this.offsetWidth ? Or this.style.width ?

Or given that you seem to be using jQuery you might also look at $(this).width() .