Method addFly

* [addFly description] * * @param {String} opt.color [颜色_透明度] * @param {Array} opt.curve [线的节点] * @param {Number} opt.width [宽度] * @param {Number} opt.length [长度] * @param {Number} opt.speed [速度] * @param {Number} opt.repeat [重复次数] * @re

({
        color = "rgba(255,255,255,1)",
        curve = [],
        width = 1,
        length = 10,
        speed = 1,
        repeat = 1,
        texture = null,
        callback
    } = opt)