浏览器控制台JS 提取章节目录

let topul=document.querySelector('ul.tree-ul.tree-top-ul');
let z1=topul.querySelectorAll('li[data-level="1"]');
txt=[];
i1=0;
z1.forEach(x1=>{
    i1++;
    i2=0;
    //打印一级章节
    t1=x1.querySelector('a').innerText;
    //console.log('1级标题：',t1);
    //查找二级章节
    z2=x1.querySelectorAll('li[data-level="2"]');
    z2.forEach(x2=>{
        i2++;
        i3=0;
        t2=x2.querySelector('a').innerText;
        //console.log('2级标题：',t2);
        z3=x2.querySelectorAll('li[data-level="3"]');
        z3.forEach(x3=>{
            i3++;
            i4=0;
            t3=x3.querySelector('a').innerText;
            //console.log('3级标题：',t3);
            z4=x3.querySelectorAll('li[data-level="4"]');
            if(z4.length!=0){
                z4.forEach(x4=>{
                    i4++;
                    i5=0;
                    t4=x4.querySelector('a').innerText;
                    //console.log('4级标题：',t4);
                    z5=x4.querySelectorAll('li[data-level="5"]');
                    if(z5.length!=0){
                        z5.forEach(x5=>{
                            i5++;
                        t5=x5.querySelector('a').innerText;
                        console.log(i1+t1,i2+t2,i3+t3,i4+t4,i5+t5);
                        //txt.push(i1+t1+' '+i1+'.'+i2+t2+' '+i1+'.'+i2+'.'+i3+t3+' '+i1+'.'+i2+'.'+i3+'.'+i4+t4+' '+i1+'.'+i2+'.'+i3+'.'+i4+'.'+i5+t5);
                        txt.push(i1+t1+' '+i1+'.'+i2+t2+' '+i3+t3+' '+i4+t4+' '+i5+t5);
 
                    })
                    }
                    else{
                        console.log(i1+t1,i2+t2,i3+t3,i4+t4);   
                        //txt.push(i1+t1+' '+i1+'.'+i2+t2+' '+i1+'.'+i2+'.'+i3+t3+' '+i1+'.'+i2+'.'+i3+'.'+i4+t4);
                        txt.push(i1+t1+' '+i1+'.'+i2+t2+' '+i3+t3+' '+i4+t4);
                    }
                })  
            }
            else
            {//元素存入数组，结束
                console.log(i1+t1,i2+t2,i3+t3);
                //txt.push(i1+t1+' '+i1+'.'+i2+t2+' '+i1+'.'+i2+'.'+i3+t3);
                txt.push(i1+t1+' '+i1+'.'+i2+t2+' '+i3+t3);
 
            }
 
            })
        })
    })
 
 
// 创建一个Blob对象，包含要写入的文本
var blob = new Blob([txt.join('\r\n')], { type: 'text/plain' });
 
// 创建一个链接，指向这个Blob对象
var downloadUrl = URL.createObjectURL(blob);
 
// 创建一个<a>元素，用于下载文件
var link = document.createElement('a');
link.href = downloadUrl;
 
// 设置下载的文件名
link.download = 'data.txt'; 
 
 
// 触发点击事件，开始下载
document.body.appendChild(link);
link.click();
 
// 清理
URL.revokeObjectURL(downloadUrl);
document.body.removeChild(link);