javascript Simple Method to Realize Equal Scale Picture Reduction

In this paper, an example is given to describe the simple method of reducing pictures in equal scale by javascript. Share it for your reference, as follows:

// Scale out the picture 
function changeImg(obj,width,height) {
  var img = new Image();
  img.src = document.getElementById(obj.id).src
  var ys_w = img.width;
  var ys_h = img.height;
  if(ys_w > width || ys_h > height)
  {
    var scale;
    var scale1 = ys_w / width;
    var scale2 = ys_h / height;
    //alert(scale1+","+scale2);
    if(scale1 > scale2)
    {
      scale = scale1;
    }
    else
    {
      scale = scale2;
    }
    document.getElementById(obj.id).style.width = ys_w / scale;
    document.getElementById(obj.id).style.height = ys_h / scale;
  }
}

More readers interested in JavaScript can check the topics of this site: "Summary of JavaScript Switching Effects and Skills", "Summary of JavaScript Search Algorithm Skills", "Summary of JavaScript Animation Effects and Skills", "Summary of JavaScript Error and Debugging Skills", "Summary of JavaScript Data Structure and Algorithm Skills", "Summary of JavaScript Traversal Algorithms and Skills" and "Summary of JavaScript Mathematical Operation Usage"

I hope this article is helpful to everyone's JavaScript programming.