js常用代码

下载文件

    let blob = new Blob([res], { type: 'application/vnd.ms-excel;charset=utf-8' }); //application/vnd.openxmlformats-officedocument.spreadsheetml.sheet这里表示xlsx类型
    let downloadElement = document.createElement('a');
	let href = window.URL.createObjectURL(blob); //创建下载的链接
	downloadElement.href = href;
	downloadElement.download = '报表.xlsx'; //下载后文件名
	document.body.appendChild(downloadElement);
	downloadElement.click(); //点击下载
	document.body.removeChild(downloadElement); //下载完成移除元素
    window.URL.revokeObjectURL(href); //释放掉blob对象

数字三位,分割

function thousandPoints(value) {
  if (!value) return 0;
  return value.toString().replace(/(\d)(?=(?:\d{3})+$)/g, '$1,');
}