callback can't excute

[yursile]

`

      <g id="share2">
          <ellipse class="share1" cx="44.667" cy="33.167" rx="6" ry="5.833"/>
          <circle class="share2" cx="49.333" cy="56" r="6"/>
          <circle class="share3" cx="33.208" cy="46.792" r="5.875"/>
          <path class="share4" style="fill:none;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;" d="M46.595,30.333 35.667,46.333 50.083,57"/>
      </g>

`

js:
var svgMorpheus = new SVGMorpheus('#icon'); svgMorpheus.to("#share1", {duration: 1000},function(){ alert("fuck") });

the morph can run correctly, but callback just can not excute

please help!