One line of code can make your JavaScript code faster with IE.

I discovered a single line of code that make JavaScript code faster with IE. The line is:

/*@cc_on _d=document;eval('var document=_d')@*/

You can try the next code with IE:

// Before
var date = new Date;
for (var i = 0; i < 100000; i++) document; 
alert(new Date - date);

/*@cc_on _d=document;eval('var document=_d')@*/

// After
date = new Date;
for (var i = 0; i < 100000; i++) document; 
alert(new Date - date);

I show you another code with same concept:

/*@cc_on
eval((function(props) {
  var code = [];
  for (var i = 0 l = props.length;i<l;i++){
    var prop = props[i];
    window['_'+prop]=window[prop];
    code.push(prop+'=_'+prop)
  }
  return 'var '+code.join(',');
})('document self top parent alert setInterval clearInterval setTimeout clearTimeout'.split(' ')));
@*/

Try it!