如何高效利用长尾词优化我的 todolist 列表？

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css/* CSS 文档 */ul { list-style-type: none; margin: 0; padding: 0;}

homework.css

@charset "utf-8"; /* CSS Document */ ul{ list-style-type: none; margin: 0; padding: 0; } #to-do-list{ background-image: url(homework-background.jpg); background-size: 100%; padding: 5%; width: 55%; height: 65%; overflow: auto; border: 6px #555 solid; top: 40%; left: 40%; position: absolute; transform: translate(-45%,-45%); color: white; font-family: cursive; font-size: xx-large; } #clock img{ width: 15px; height: 15px; } #clock{ font-size: 1.2em; color: white; text-align: center; margin: 0; padding: 0; position: absolute; top: 70%; left: 55%; } homework.html

TO DO LIST

: :
年 月 日
星期 homework.js

// JavaScript Document var oUl1=document.getElementById('ul1'); var oTxt1=document.getElementById('txt1'); var oBtn1=document.getElementById('btn1'); oBtn1.onclick=function(){ if(oTxt1.value==''){ alert('请输入点儿什么吧！'); }else{ var oNewLi=document.createElement('li'); var oUl1AllLi=document.getElementsByTagName('li'); var oSpan=document.createElement('span'); oSpan.innerHTML=oTxt1.value; var oIpt=document.createElement('input'); oIpt.type='checkbox'; oIpt.name='checkbox1'; oNewLi.appendChild(oIpt); oNewLi.appendChild(oSpan); if(oUl1AllLi.length===0){ oUl1.appendChild(oNewLi); }else{ oUl1.insertBefore(oNewLi,oUl1AllLi[0]); } oTxt1.value=''; } }; var oBtn2=document.getElementById('btn2'); oBtn2.onclick=function(){ var oCheckbox=document.getElementsByName('checkbox1'); for(var i=0;i