纯js实现下载功能【附上js代码】

纯js实现文件下载

以下是js文本，粘贴复制一键搞定：

function exportExcel(title){

var type='xlsx';var tables=document.getElementsByTagName('table');

var titleTable=tables[0];

if(titleTable==undefined){alert("未找到需要导出的数据");

return false}

var keyMap=[];for(var i=0;i<titleTable.rows[0].cells.length;i++){

keyMap.push(getTdText(titleTable.rows[0].cells[i]))}

var data=[];for(var k=0;k<tables.length;k++){

for(var i=0;i<tables[k].rows.length;i++){

var obj={};for(var j=0;j<keyMap.length;j++){

obj[keyMap[j]]=getTdText(tables[k].rows[i].cells[j])}data.push(obj)};}

var tmpdata=[];data.map((v,i)=>keyMap.map((k,j)=>Object.assign({},{

v:v[k],position:(j>25?getCharCol(j):String.fromCharCode(65+j))+(i+1)})))

.reduce((prev,next)=>prev.concat(next)).forEach((v,i)=>tmpdata[v.position]={v:v.v});

var outputPos=Object.keys(tmpdata);

var tmpWB={SheetNames:['mySheet'],Sheets:

{'mySheet':Object.assign({},tmpdata,{'!ref':outputPos[0]+':'+outputPos[outputPos.length-1]})}};

var tmpDown=new Blob([s2ab(XLSX.write(tmpWB,

{bookType:(type==undefined?'xlsx':type),bookSST:false,type:'binary'}))], {type:""});

var href=URL.createObjectURL(tmpDown);var aLink=document.createElement('a');

aLink.href=href;aLink.download=title==undefined?new Date().getTime():title+".xlsx";

aLink.style.display='none';document.body.appendChild(aLink);aLink.click();setTimeout(function()

{URL.revokeObjectURL(tmpDown)},100)}

function s2ab(s){var buf=new ArrayBuffer(s.length);var view=new Uint8Array(buf);

for(var i=0;i!=s.length;++i)view[i]=s.charCodeAt(i)&0xFF;return buf}function getCharCol(n)

{let temCol='',s='',m=0;while(n>0){m=n%26+1;s=String.fromCharCode(m+64)+s;n=(n-m)/26}return s}

function getTdText(node){var child=node.Children;if(child==undefined){return node.innerText;}

else{var text='';for(var i=0;i<child.length;i++){text+=getTdText(child[i]);}return text;}}

导出excel可由自己命名，填在方法里；