2020-02-16 标签:prototype,学习,工具,函数,方法,a,f,h,r,w,try,document,瑞士,军刀,swiss,army,knife,provided,string

$ $$ $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