<style lang="less">
</style>
<template>
 <div>
 <h2>这是一个使用iview的table组件，做展示用，你当然可以在自己的项目里用自己想要的任何table组件</h2>
 <Table :columns="column" :data="tableData"></Table> //iview的Table组件
 <Button @click="toExcel">导出表格数据到Excel</Button> //导出excel的按钮
 </div>
</template>
<script>
import transform from './exportToExcel.js'  //这个方法来源于二步骤封装的方法，往下看
export default {
 name:'App',    //这是一个父组件，名称为App.vue
 data(){
 return {
  tableData:[],  //表格数据
  column:[]			 //表格的列
 }		
 },
 methods:{
 toExcel(){
 //调用我们封装好的方法，传3个参数过去，分别为：数据，文件名，回到函数(可根据自己需求决定回调是否需要)
  transform(this.tableData, '我是文件名', this.callback) 
 },
 callback(info){
  console.log(info)
 }
 },
 created(){
 //模拟网络请求
 this.tableData = [
  {index:1,name:'我是1号',age:18,sex:'男',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:2,name:'我是2号',age:18,sex:'男',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:3,name:'我是3号',age:18,sex:'男',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:4,name:'我是4号',age:18,sex:'男',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:5,name:'我是5号',age:18,sex:'男',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:6,name:'我是6号',age:18,sex:'女',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:7,name:'我是7号',age:18,sex:'女',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:8,name:'我是8号',age:18,sex:'女',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:9,name:'我是9号',age:18,sex:'女',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:10,name:'我是10号',age:18,sex:'女',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:11,name:'我是11号',age:18,sex:'男',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:12,name:'我是12号',age:18,sex:'男',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:13,name:'我是13号',age:18,sex:'女',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:14,name:'我是14号',age:18,sex:'女',hobby:'web',hair:'thick',salaried:'99999999'},
  {index:15,name:'我是15号',age:18,sex:'男',hobby:'web',hair:'thick',salaried:'99999999'}
 ]
 this.column = [
  {key:'index',title:'序号',width:120},
  {key:'name',title:'姓名',width:120},
  {key:'age',title:'年龄',width:120},
  {key:'sex',title:'性别',width:120},
  {key:'hobby',title:'爱好',width:120},
  {key:'hair',title:'发量',width:120},
  {key:'salaried',title:'薪水',width:120}
  ]
 }
}
</script>

var idTmr;
//自己定义一个函数transform，在里面写我们的业务逻辑
function transform(table, name, callback) { //table为表格数据,name为导出文件名,
      //callback为导出完毕回调,方便你知道导出完成了(可根据自己需求决定是否需要)
 let tableInnerHTML = ''
 let headerData = ['序号','姓名','年龄','性别','爱好','发量','薪水']
 let bodyData = table  //这里对应是表格数据，我们只需要传过来即可
 //拼接完全使用thead、tbody、tr、td、th，并且相应的tr、th、td里可以写一些类似colspan(决定占几列)
 //rowspan(决定占几行)的属性、可以用作合并行、合并列等高级操作
 tableInnerHTML += '<thead><tr>'; //头部部分开始拼接！
 tableInnerHTML += `<th colspan=${headerData.length} 
 				style='background:#CCFFFF;border:solid;'>` + "程序员的将来" + "</th></tr>"
 tableInnerHTML += '<tr>' 
 headerData.forEach(item => {   
   tableInnerHTML += "<th rowspan='1' style='background:#FFFFCC;border:solid'>"
   			 + item + "</th>"
  })
 tableInnerHTML += '</tr></thead>';  //头部部分结束
 tableInnerHTML += '<tbody>'   //身体部分开始
 bodyData.forEach(item => {      
 tableInnerHTML += "<tr>"
  tableInnerHTML += "<td align='center' style='border:solid'>" + item.index + "</td>"
  tableInnerHTML += "<td align='center' style='border:solid'>" + item.name + "</td>"
  tableInnerHTML += "<td align='center' style='border:solid'>" + item.age + "</td>"
  tableInnerHTML += "<td align='center' style='border:solid'>" + item.sex + "</td>"
  tableInnerHTML += "<td align='center' style='border:solid'>" + item.hobby + "</td>"
  tableInnerHTML += "<td align='center' style='border:solid'>" + item.hair + "</td>"
  tableInnerHTML += "<td align='center' style='border:solid'>" + item.salaried + "</td>"
  tableInnerHTML += "</tr>"
 })
  tableInnerHTML += '</tbody>'; //身体结束
//------------OK，到此为止拼接工作做完，也就是基本的数据已经被拼接成表格了--------------------
//tip开始(下面还有个tip结束的位置)
/*-------从tip开始到tip结束的过程是判断浏览器类型步骤，做兼容性处理！对于你来说你完全可以不用
		 深入理解这里面的逻辑，直接复制到自己的项目里去，不会存在任何浏览器兼容性的问题！*/
 function getExplorer() {
  var explorer = window.navigator.userAgent;
  if (explorer.indexOf('MSIE') >= 0) {
   return 'ie';  // ie
  } else if (explorer.indexOf('Firefox') >= 0) {
   return 'Firefox'; // firefox
  } else if (explorer.indexOf('Chrome') >= 0) {
   return 'Chrome'; // Chrome
  } else if (explorer.indexOf('Opera') >= 0) {
   return 'Opera';  // Opera
  } else if (explorer.indexOf('Safari') >= 0) {
   return 'Safari'; // Safari
  };
 };

 if (getExplorer() !== 'Safari' && name.substr(-1, 4) !== '.xls') {
  name += '.xls';
 }
 if (getExplorer() === 'ie') {
  var curTbl = table;
  var oXL = new ActiveXObject('Excel.Application');
  var oWB = oXL.Workbooks.Add();
  var xlsheet = oWB.Worksheets(1);
  var sel = document.body.createTextRange();
  sel.moveToElementText(curTbl);
  sel.select();
  sel.execCommand('Copy');
  xlsheet.Paste();
  oXL.Visible = true;
  try {
var fname=oXL.Application.GetSaveAsFilename('Excel.xls', 'Excel Spreadsheets (*.xls), *.xls');
  } catch (e) {
   print('Nested catch caught ' + e);
  } finally {
   oWB.SaveAs(fname);
   // oWB.Close(savechanges = false);
   oXL.Quit();
   oXL = null;
   idTmr = setInterval(Cleanup(), 1);
  }
 } else {
  tableToExcel(tableInnerHTML, name, callback); /*在这调用下面的一个方法，传入拼接完成
          	 的表格，文件名，回调函数。该方法是干嘛的请往下看*/
 }
 //tip结束
} //此括号结束，我们自己封装的transform方法也结束了！90%的逻辑完成了！

/*下面的两个函数对于你来说你也完全不用深入理解里面的逻辑，你只要知道，他是在帮助你做转换，帮助你
 将拼接好的HTML字符串模板真正地转换并且输出到Excel里面去，直接当成固定书写方法，直接拿来用即可*/
function Cleanup() {
 window.clearInterval(idTmr);
}
let tableToExcel = (function () {
 let template = '<html><head><meta charset="UTF-8"></head><body><table>{table}</table></body></html>';
 let format = function (s, c) {
  return s.replace(/{(\w+)}/g, function (m, p) { return c[p]; });
 };
 return function (table, name, callback) {
  let ctx = { worksheet: name || 'Worksheet', table: table };
  let blob = new Blob([format(template, ctx)]);
  let a = document.createElement('a');
  a.href = URL.createObjectURL(blob);
  a.download = name;  //这里这个name就是对应的文件名！
  a.click();
  a.remove();
  callback('success'); /*这里调用我们自己传入的回调方法，这样导出Excel完成后你就能
  						 在外面知道导出完毕，并且再往下做自己其他的逻辑*/
 };
})();
export default transform; //导出自己封装的transform方法