搜索轨迹搜索曲目例子： var Prostopleer = require ( 'searchtracks/prostopleer' ) ; var SearchTracks = require ( 'searchtracks' ) ; var searchTracks = new SearchTracks ( new Prostopleer ( ) ) ; var params = { query : 'slot' , limit : 20 } ; searchTracks . search ( params , function ( error , response ) { if ( ! error ) { if ( response . success ) {