returns the dependency link object by the specified id
| id | string | number | the link id | 
| Link | the link object | 
gantt.addLink({
    id:1,
    source:1,
    target:2,
    type:1
});
gantt.getLink(1);// -> {id:1, source:1, target:2, type:1}
For information about how to get all links connected to a specific task, see the Getting the Link Object/Id article.
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