如何在浏览器实现文件下载，保存数据？

                   document.querySelector(‘button‘).onclick = function(){
				var records = "这里是要下载的内容";
				downloadFn(records,‘下载.txt‘)
			}
			
			function downloadFn (content,filename){
				var blob;
				var eleLink = document.createElement(‘a‘);
				if(‘download‘ in  eleLink){
					eleLink.download = filename;
					eleLink.style.display = ‘none‘;
					blob = new Blob([content]);
					eleLink.href = window.URL.createObjectURL(blob);
					document.body.appendChild(eleLink);
					eleLink.click();
					document.body.removeChild(eleLink)
				}else{
					//浏览器兼容
					blob = new Blob([content]);
					window.navigator.msSaveOrOpenBlob(blob,filename)
				}
			}