function queryComponentInstance(ctx, id) {
    let isSelectAll = Array.isArray(id);
    isSelectAll && (id = id[0]);

    // query multiple components is not supported
    let key = id.substr(1);
    return ctx.$child(key);
}
function queryComponentInstance(ctx, id) {
    let isSelectAll = Array.isArray(id);
    isSelectAll && (id = id[0]);

    
    let key = id.substr(1);
    return ctx.$child(key);
}
function queryComponentInstance ( ctx , id ) { let isSelectAll = Array . isArray ( id ) ; isSelectAll && ( id = id [ 0 ] ) ; // query multiple components is not supported let key = id . substr ( 1 ) ; return ctx . $child ( key ) ; }
Query component instance by the given id

@inner
@param {Object} ctx the component context
@param {string} id the component reference id
@return {?Object}
Query component instance by the given id