語法錯誤的JavaScript類

Question

我打一點點東西，這裏是我迄今爲止

class Person { 
constructor(sex, name, age) { 
    this.sex = sex || (
     for (var i = 0; i < 1; i++) { 
      let sexes = ['f', 'm'], 
       picker = Math.round(Math.random()); 
      picker === 1 ? this.sex = sexes[0] : this.sex = sexes[1]; 
     }); 
    this.name = name || (
     let names = ["Jane Doe", "Jon Doe"]; 
     sex === 'f' ? this.name = names[0] : this.name = names[1];); 
    this.age = age || (
     let rand = Math.floor(Math.random() * (50 - 20 + 1) + 20); 
     age = rand;) ; 
} }//end class 

我得到這個下面的錯誤代碼，我不知道該怎麼辦纔好= \：

/Users/Username/Desktop/code/file.js:23 
      for (var i = 0; i < 1; i++) { 
      ^^^ 
SyntaxError: Unexpected token for 
    at createScript (vm.js:74:10) 
    at Object.runInThisContext (vm.js:116:10) 
    at Module._compile (module.js:533:28) 
    at Object.Module._extensions..js (module.js:580:10) 
    at Module.load (module.js:503:32) 
    at tryModuleLoad (module.js:466:12) 
    at Function.Module._load (module.js:458:3) 
    at Function.Module.runMain (module.js:605:10) 
    at startup (bootstrap_node.js:158:16) 
    at bootstrap_node.js:575:3 

Answer 1

作爲評價提到@Nisarg Shah，代碼被期待值以下的||，不是幾行代碼來執行。

相反，您可以將這些代碼行放入一個函數中並調用它以便在未提供值時提供默認值。

class Person { 
 
    constructor(sex, name, age) { 
 
    function getRandomSex() { 
 
     for (var i = 0; i < 1; i++) { 
 
     let sexes = ['f', 'm'], 
 
      picker = Math.round(Math.random()); 
 
     return picker === 1 ? sexes[0] : sexes[1]; 
 
     } 
 
    } 
 

 
    function getName(sex) { 
 
     let names = ["Jane Doe", "Jon Doe"]; 
 
     return sex === 'f' ? names[0] : names[1]; 
 
    } 
 

 
    function getRandomAge() { 
 
     return Math.floor(Math.random() * (50 - 20 + 1) + 20); 
 
    } 
 
    this.sex = sex || getRandomSex(); 
 
    this.name = name || getName(this.sex); 
 
    this.age = age || getRandomAge(); 
 
    } 
 
} //end class 
 

 
var me = new Person(); 
 
console.log(me);