web在线预览office附件

function funs(){
            var u = 'http://49.234.20.196/file/oss/download/files?object=1590c52481f147118611b4a40f834339.xls&fileName=部门模板.xls'
            window.open('https://view.officeapps.live.com/op/view.aspx?src='+ u)
        }

默认文档在新的窗口预览；