删除字符串首位空格

//删除首尾空格
var pattern = /^\s+/;                            //强制首
var str = '          goo  gle            ';
var result = str.replace(pattern, '');
pattern = /\s+$/;                            //强制尾
result = result.replace(pattern, '');
alert('|' + result + '|');

类似于$.trim(str)方法