//扩展实例1 字符串中首字符转大写
var test=‘  this is  ‘;
String.prototype.mytrim=function(){
    var re=/^\s+(.*?)\s+$/;
    return this.replace(re,‘$1‘);
};
console.log(‘[‘+test+‘]‘);
console.log(‘[‘+test.trim()+‘]‘);

//test.mytrim() 等价于：test.replace(re,‘$1‘);
console.log(‘[‘+test.mytrim()+‘]‘);

name = ‘aaa bbb ccc‘;
uw=name.replace(/\b\w+\b/g, function(word){
        console.log(word);
        return word.substring(0,1).toUpperCase()+word.substring(1);}
);