##新人求助贴
用cocos creater的jumpBy方法实现的跳跃动作脚本，现在的状况是短按空格键，动作很正常，但是长按的话节点就会飘在空中，应该怎么改？
cc.Class({
extends: cc.Component,
properties: {
jumpDuration:0,
jumpHeight:0,
},
setInputControl: function()
{
var self = this;
cc.eventManager.addListener(
{
event:cc.EventListener.KEYBOARD,
onKeyPressed: function(keyCode,event)
{
if(keyCode==cc.KEY.space)
{
self.wthJump = true;
}
},
onKeyReleased: function(keyCode,event)
{
if(keyCode==cc.KEY.space)
{
self.wthJump = false;
}
},
}, self.node);
},
setJump: function()
{
var actionBy= cc.jumpBy(this.jumpDuration, cc.p(0,0),this.jumpHeight, 1);
this.node.runAction(actionBy);
},
onLoad: function () {
this.wthJump= false;
this.setInputControl();
},
update:function(dt){
if(this.wthJump)
{
this.setJump();
}
}
},
});