摘要：
function getIndex(ele){ var parent=ele.parentNode; var brothers=parent.children; for(var i=0,len=brothers.length;i<len;i++){ if(ele==brothers[i]){ ret 阅读全文
摘要：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title></title> <style> .box{ width: 100px; height: 100px; position: absolute; left:300.5 阅读全文