layer提示框添加多个按钮选择的实例

如下所示: function jumpChoose(argu) { //询问框 var index = layer.confirm('下载文件还是在线预览呢?', { btn: ['在线预览','下载',"关闭"], //按钮 shade: false //不显示遮罩 }, function(){ //关闭提示框 layer.close(index); }, function(){ //关闭提示框 layer.close(index); }, function(){ //关闭提示框 layer.close(index); }); }