eid, fp, track_id, risk_control 参数如何获取？

参照wiki上面常用问题的代码
`var eid = $('#eid').val();
var fp = $('#fp').val();
var trackId = getTakId();
var riskControl = $('#riskControl').val();
console.log(`eid = ${eid}\nfp = ${fp}\ntrack_id = ${trackId}\nrisk_control = ${riskControl}`);`
但是提示getTakId不存在！