我怎样才能在一个数字之间?

//define a health Object
//anywhere in your code , instead of accessing the health integer, you 
//would access its value property. 
var health:Object = {value:100};

var amount:int = 50;

Tweener.addTween(this.health, {value:amount, 
                               onComplete:healCompleted, 
                               time:0.5, 
                               transition:"easeOutExpo"});

Tweener.addTween(this, { health:amount, 
                         onComplete:healCompleted, 
                         time:0.5, 
                         transition:"easeOutExpo"});

health public