字符串连接和StringBuffer的对比
IE6:
Concatenation with plus: 79 milliseconds
Concatenation with StringBuffer: 46 milliseconds
IE7:
Concatenation with plus: 78 milliseconds
Concatenation with StringBuffer: 47 milliseconds
IE8:
Concatenation with plus: 0 milliseconds
Concatenation with StringBuffer: 15 milliseconds
FF:
Concatenation with plus: 3 milliseconds
Concatenation with StringBuffer: 5 milliseconds
Opera:
Concatenation with plus: 0 milliseconds
Concatenation with StringBuffer: 16 milliseconds
Chrome:
Concatenation with plus: 1 milliseconds
Concatenation with StringBuffer: 3 milliseconds
Safari:
Concatenation with plus: 1 milliseconds
Concatenation with StringBuffer: 1 milliseconds
