javascript - About looping to create an array of objects and adding random values

Question

var arr = [ { email: '', role: 'normal', password: '' },
  { email: '', role: 'normal', password: '' },
  { email: '', role: 'normal', password: '' },
  { email: '', role: 'normal', password: '' },
  { email: '', role: 'normal', password: '' },
  { email: '', role: 'normal', password: '' } ]

arr.forEach(o => { o.password =Math.random() })

output :[ { email: '', role: 'normal', password: 0.16326031488429638 },
  { email: '', role: 'normal', password: 0.4941354999549721 },
  { email: '', role: 'normal', password: 0.6802056630925 },
  { email: '', role: 'normal', password: 0.5038916232454755 },
  { email: '', role: 'normal', password: 0.5232000715886489 },
  { email: '', role: 'normal', password: 0.1599782533612224 } ]

当使用 for 创建一个 对象数组

 var obj  = {
    email: '1',
    role: 'normal',
    password: ''
},array=[]

for(let i =0;i<6;i++){
     array.push(function(){
         obj.password = Math.random()
         return obj
     })   
}

output: [ { email: '1', role: 'normal', password: 0.4311454570811686 },
  { email: '1', role: 'normal', password: 0.4311454570811686 },
  { email: '1', role: 'normal', password: 0.4311454570811686 },
  { email: '1', role: 'normal', password: 0.4311454570811686 },
  { email: '1', role: 'normal', password: 0.4311454570811686 },
  { email: '1', role: 'normal', password: 0.4311454570811686 } ]

My problem is that in the second object array generated by for, the value of obj.password is not repeated

.............

Answer 1

Reason

This question is very hidden.

obj is a quote. It means that every time you push it’s the same obj

As for why the value is always the same, it’s because what you modify is the same obj, so the value is based on the last random number.

---

How to modify

var arr = [ { email: '', role: 'normal', password: '' },
  { email: '', role: 'normal', password: '' },
  { email: '', role: 'normal', password: '' },
  { email: '', role: 'normal', password: '' },
  { email: '', role: 'normal', password: '' },
  { email: '', role: 'normal', password: '' } ]

arr.forEach(e => e.password = Math.random()); 

arr.forEach(console.log);

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