JavaScript 格式化字串 & 需要轉義的正則表示式
阿新 • • 發佈：2019-02-10
<!DOCTYPE html> <html> <head> <meta charset="utf8"> <script> String.prototype.format = function() { let result = this; console.log(arguments) if(arguments.length == 1 && typeof(arguments[0]) == "object") { for(let key in arguments[0]) { let reg = new RegExp("{" + key + "}", "g"); result = result.replace(reg, arguments[0][key]); } } else if(arguments.length > 0 ) { for (let i = 0; i < arguments.length; i++) { if(arguments[i] != undefined) { //注意：花括號內跟數字表示前面的字元出現多少次。因此這裡需要轉義，而在字串裡面，轉義字元又要多重複一次 let reg = new RegExp("\\{" + i + "\\}", "g"); result = result.replace(reg, arguments[i]); } }; } return result; } console.log("The boy's name is {name}, and age is {age}.".format({name: "bob", age: 24})); console.log("The boy's name is {0}, and age is {1}.".format("bob", 24)); </script> </head> <body> </body> </html>