With
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The "with" keyword is used to specify an object to which all of the unreferenced properties and methods in a following block of code are to be applied.
for example:
Instead of coding
document.write('text1');
document.write('text2');
document.write('text3');
you could use
var x = body.scrollLeft;
write('text1');
write('text2');
write('text3');
}
Of course using this construct results in code that may be somewhat shorter but it will also take a lot longer to run since each variable within the with block needs to be checked to see whether or not it is a property of the object that the with block references.
A more efficient coding that is almost as short is where you assign a much shorter name to reference the object and use that instead of the original object name. For example:
var x = d.body.scrollLeft;
d.write('text1');
d.write('text2');
d.write('text3');
