?function?getByClass(oParent,className){??????????????????????????????//從oParent里面搜尋className
?????var?arr=new?Array();
?????var?obj=oParent.getElementsByTagName("*")????????????????????????//從oParent里面調(diào)出所有tag
for(var?i=0;i<obj.length;i++){
???if?(obj[i].className==className){?????????????????????????????????????
??arr.push(obj[i])
???}
}
?????return?arr;
?}

反對(duì) 回復(fù) 2016-10-25

李曉健
這個(gè)會(huì)有問題的，如果一個(gè)標(biāo)簽上有多個(gè)class，就掛了。

回復(fù) 2016-10-25
stone310
簡(jiǎn)單版...做項(xiàng)目沒法用的，做測(cè)試可以用用

回復(fù) 2016-10-25

李曉健

TA貢獻(xiàn)1036條經(jīng)驗(yàn) 獲得超461個(gè)贊

先獲取所有標(biāo)簽，然后循環(huán)，看哪一個(gè)標(biāo)簽的className屬性中包含有你要先的那個(gè)class;

var?getElementsByClassName?=?function?(searchClass,?node,tag)?{
????if(document.getElementsByClassName){
????????var?nodes?=?(node?||?document).getElementsByClassName(searchClass),result?=?[];
????????for(var?i=0?;node?=?nodes[i++];){
????????????if(tag?!==?"*"?&&?node.tagName?===?tag.toUpperCase()){
????????????????result.push(node)
????????????}else{
????????????????result.push(node)
????????????}
????????}
????????return?result
????}else{
????????node?=?node?||?document;
????????tag?=?tag?||?"*";
????????var?classes?=?searchClass.split("?"),
????????????elements?=?(tag?===?"*"?&&?node.all)??node.all?:?node.getElementsByTagName(tag),
????????????patterns?=?[],
????????????current,
????????????match;
????????var?i?=?classes.length;
????????while(--i?>=?0){
????????????patterns.push(new?RegExp("(^|\s)"?+?classes[i]?+?"(\s|$)"));
????????}
????????var?j?=?elements.length;
????????while(--j?>=?0){
????????????current?=?elements[j];
????????????match?=?false;
????????????for(var?k=0,?kl=patterns.length;?k<kl;?k++){
????????????????match?=?patterns[k].test(current.className);
????????????????if?(!match)?break;
????????????}
????????????if?(match)?result.push(current);
????????}
????????return?result;
????}
}

反對(duì) 回復(fù) 2016-10-24