1 /* 2 var a = [1,2,3]; 3 for(var each in a){ 4     document.write(each+":" + a[each]+‘<br />‘) 5 } 6 结果： 7     0:1 8     1:2 9     2:310 */


11 /*with语句实例：12     frames[1].document.forms[0].name.value = http://www.mamicode.com/‘‘;>13     frames[1].document.forms[0].address.value = http://www.mamicode.com/‘‘;>14     frames[1].document.forms[0].email.value = http://www.mamicode.com/‘‘;>15     16     可以写成下面with语句：17     with(frames[1].document.forms[0]){18         name.value = http://www.mamicode.com/‘‘;>19         address.value = http://www.mamicode.com/‘‘;>20         email.value = http://www.mamicode.com/‘‘;>21     }22 */