Tips for writing JavaScript code

1. Use of the plus sign "+"

Http://blog.csdn.net/semanwmj/article/details/7191940

2. Use of logical operators

 
VaR A = x & Y;
 

When x = true, A = y;

When x = false, A = X;

If X is false, the entire expression (X & Y) will not continue to be computed. However, if X is true, you must check whether y is true or false to determine the entire expression, | likewise.

The following is a section of kissy. JS:

 
VaR host = This, seed = (host & host [s]) || {};
 

Here we use & to get the if effect?

3. array push is more efficient than directly adding strings.

VaR S, html = []; html. Push ("AAAAA", "bbbbbb", "cccccccc"); s = html. Join ('');
 

4. Double exclamation point

 
Return !! $. Data (ELEM, name );
 

Is to get the meaning of the Boolean value of the variable, convert $. Data (ELEM, name) to a Boolean value, return