var reg = /^(\d{3})\d{4}(\d{4})$/;
var a = 18731230865;
a = a.replace(reg, '$1****$2');
var reg = /^(\d{3})\d{4}(\d{4})$/;
var a = 18731230865;
a = a.replace(reg, '$1****$2');
/* 功能:獲取App根目錄 實例:app.getRoot() 當前訪問路徑:/page/index.html,結果:../ 當前訪問路徑:/page/child/index.html,結果:../.