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var setupDefaults = require('./setupDefaults')
var eqNull = require('./eqNull')
/**
* 获取一个全局唯一标识
*
* @param {String} prefix 前缀
* @return {Number}
*/
function uniqueId (prefix) {
return '' + (eqNull(prefix) ? '' : prefix) + (setupDefaults.keyId++)
}
module.exports = uniqueId