相关疑难解决方法(0)

在不知道JavaScript的键的情况下Object,我怎么能像...

var obj = {
   param1: 'something',
   param2: 'somethingelse',
   param3: 'another'
}

obj[param4] = 'yetanother';

... INTO ...

var str = 'param1=something&param2=somethingelse&param3=another&param4=yetanother';

...？