How to extract number from a string in javascript

Question

I have an element in javascript like follows:

 280ms

I want to extract 280 from the span element. How can I do it?

Answer 1

in general for numbers no mather negative or positive

  blah blah
  285blahblah


var html= document.getElementsByTagName('div')[0].innerHTML;// or $('div').html() if jquery

var number = parseFloat(html.match(/-*[0-9]+/));

http://jsfiddle.net/R55mx/