一个更高效的JavaScript版trim函数
http://code.google.com/p/update-javascript-trim/
常见的写法为：
function trim(s){
return s.replace(/^\s+|\s+$/g, '');
}
优化后trim函数的代码如下：
function trim(str) {
str = str.replace(/^\s+/g, '');
for(var i = str.length - 1; i >= 0; i--){
if(!/^\s$/.test(str.substr(i,1))) break;
}
return str.substring(0, i + 1)
}
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