Prototype 学习 工具函数学习($方法)
$ $$ $A $F $H $R $w Try.these document.getElementsByClassName $方法——被成为瑞士军刀(Swiss Army knife) If provided with a string, returns the element in the doc
$ $$ $A $F $H $R $w Try.these document.getElementsByClassName $方法——被成为瑞士军刀(Swiss Army knife) If provided with a string, returns the element in the doc