Property属性

Item {  
    property int theNumber  
    property string theString  
    property url theUrl  
    property Item someItem  
    property Rectangle someRectangle  
    property var someNumber: 1.5  
    property var someString: "abc"  
    property var someBool: true  
    property var someList: [1, 2, "three", "four"]  
    property var someObject: Rectangle { width: 100; height: 100; color: "red" }  
}