Within a string statement breaking can be done by the use of a backslash, '\', at the end of the first line

For example:

document.write("This is \a program");

If we change to a new line when not within a string statement, then javaScript ignores break in the line.

For example:

var x=1, y=2,

z=

x+y;

The above code is perfectly good, but it is not advisable as it hampers debugging.