jQuery技术:jQuery：array .children（）不是函数

以下代码的灵感来自https://ignorethecode.net/blog/2010/04/20/footnotes/ ：当您将光标移到脚注符号上时，脚注将显示为工具提示。

        
Baryonyx was a theropod dinosaur of the early Cretaceous Period, about 130–125 million years ago1. An identifying specimen of the genus was discovered in 1983 in Surrey, England; fragmentary specimens2 were later discovered in other parts of the United Kingdom and Iberia. Meaning "heavy claw", Baryonyx refers to the animal's very large claw (31 cm or 12 in) on the first finger. The 1983 specimen3 is one of the most complete theropod skeletons from the UK, and its discovery attracted media attention.
 
 
 
 
Baryonyx caught and held its prey primarily with its strong forelimbs and large claws.↩
 
The creature lived near bodies of water, in areas where other theropod, ornithopod, and sauropod dinosaurs have also been found. ↩
 
It had a long, low, bulbous snout and narrow, many-toothed jaws, which have been compared to gharial jaws.↩
 
 
  var removeElements = function(text, selector) { var wrapped = $("
" + text + "
"); wrapped.find(selector).remove(); return wrapped.html(); } var $fRef = $(".footnoteRef"); for(var i=0; i<$fRef.length; i++) { var sup = $fRef.children("sup")[i]; //var sup = $fRef[i].children("sup"); //var sup = $fRef.eq(i).children("sup"); //var sup = $fRef.get(i).children("sup"); //var sup = $($fRef[i]).children("sup"); //debugger; sup.setAttribute('fnID',i); sup.onmouseover = function(event) { var fnTip = document.getElementById('fnTip'); if(fnTip) fnTip.parentNode.removeChild(fnTip); var pTip = document.createElement('div'); var fnT = document.getElementById($fRef[this.getAttribute('fnID')].getAttribute("href").substring(1)).innerHTML; pTip.innerHTML = removeElements(fnT,"a"); pTip.id = 'fnTip'; pTip.style.position = 'absolute'; pTip.style.left = (event.pageX - 180) + 'px'; pTip.style.top = (event.pageY + 20) + 'px'; pTip.style.width = '360px'; pTip.style.textIndent = '2em'; pTip.style.textAlign = 'left'; pTip.style.backgroundColor = '#FFFFE0'; pTip.style.border = '1px solid #636363'; pTip.style.padding = '5px'; pTip.style.fontSize = '12px'; pTip.style.lineHeight = '1.8'; pTip.style.borderRadius = '5px'; document.body.appendChild(pTip); }; sup.onmouseout = function(event) { var fnTip = document.getElementById('fnTip'); if(fnTip) fnTip.parentNode.removeChild(fnTip); }; }    

我的问题是行var sup = $fRef.children("sup")[i]; 似乎应该是var sup = $fRef[i].children("sup"); 或者.children（）不能在指定的jquery返回索引上工作 。 但是，这些方式（代码中的行被注释）都不起作用。 请解释为什么var sup = $fRef.children("sup")[i]; 正在工作，其他人没有工作？

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