绘制的线在iPhone6上少了一条。。

Creator 2.x
#1

Graphics绘图，绘制的三条长线，在iphone6上中间的竖线不见了，为什么啊？
this.g.lineWidth = 1;

    this.g.strokeColor = cc.color(255,255,255,255);
    this.g.moveTo(w/2,h);
    this.g.lineTo(w/2,0);
    this.g.moveTo(w/2+380,h/2+h/4);
    this.g.lineTo(w/2-380,h/2-h/4);
    this.g.moveTo(w/2-380,h/2+h/4);
    this.g.lineTo(w/2+380,h/2-h/4);
    this.g.stroke();