<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> const price=(function(){ const tactics={ ‘100-10‘:function(price){return price-parseInt(price/100)*10}, ‘200-20‘:function(price){return price-Math.floor(price/200)*20}, ‘80%‘:function(price){return price*0.8} } function calculate(price,tactic){ if(!tactics[tactic]) return ‘tactic not found‘ return tactics[tactic](price) } calculate.add=function(tactic,action){ if(tactics[tactic]){ if(confirm(`replace ${tactic}`)){ tactics[tactic]=action } } tactics[tactic]=action } calculate.remove=(tactic)=>{ if(!tactics[tactic]) return ‘tactic not found‘ delete tactics[tactic] } return calculate })() console.log(price(320,‘100-10‘)) </script> </body> </html>
原文：https://www.cnblogs.com/dissipate/p/14702993.html