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