想知道下面的代码
if((input$app != "") && (input$variable != "") && (input$variable != "All") && (input$variable1 != "") && (input$variable1 != "All") && (input$variable2 != "") && (input$variable2 != "All"))
可以写为
if((input$app != "") && (input$variable != c("","All")) && (input$variable1 != c("","All")) && (input$variable2 != c("","All")))