QML 调用JavaScript

1. javascript直接写qml文件中
Item {
     function factorial(a) {
         a = parseInt(a);
         if (a <= 0)
             return 1;
         else
             return a * factorial(a - 1);
     }

     MouseArea {
         anchors.fill: parent
         onClicked: console.log(factorial(10)) //直接调用
     }
 }

2. javascript直接写js文件中

 import "factorial.js" as MathFunctions
 Item {
     MouseArea {
         anchors.fill: parent
         onClicked: console.log(MathFunctions.factorial(10))
     }
 }
 //-------------------------------------------------
 //  js文件，文件名factorial.js
 //-------------------------------------------------
 function factorial(a) {

         a = parseInt(a);

         if (a <= 0)

             return 1;

         else

             return a * factorial(a - 1);

     }