JavaScript 中的数字模式

以下是 javascript 中的一些数字模式，这些模式在面试问题中最常被问到。

function printNum(){
 for(let i=1; i<=4; i++){
     let finalOutput = '';
     for(let j=1; j<=i; j++){
         finalOutput += i
     }
     console.log(finalOutput)
 }   
}

printNum()

output
1
1 2
1 2 3
1 2 3 4

function printNum(){
 for(let i=1; i<=4; i++){
     let finalOutput = '';
     for(let j=1; j<=i; j++){
         finalOutput += j
     }
     console.log(finalOutput)
 }   
}

printNum()

output
1
1 2
1 2 3
1 2 3 4

function printNum(){
 for(let i=1; i<=4; i++){
     let finalOutput = '';
     for (let k=1; k<=4-i;k++){
         finalOutput += " "
     }
     for(let j=1; j<=i; j++){
         finalOutput += j
     }
     console.log(finalOutput)
 }   
}

printNum()

output
      1
    1 2
  1 2 3
1 2 3 4

function printNum(){
 for(let i=1; i<=4; i++){
     let finalOutput = '';
     for (let k=1; k<=4-i;k++){
         finalOutput += " "
     }
     for(let j=1; j<=i; j++){
         finalOutput += i
     }
     console.log(finalOutput)
 }   
}

printNum()

output
      1
    1 2
  1 2 3
1 2 3 4

function printNum(){
 for(let i=1; i<=4; i++){
     let finalOutput = '';
     for (let k=1; k<=4-i;k++){
         finalOutput += " "
     }
     for(let j=1; j<=i; j++){
         finalOutput += j + " "
     }
     console.log(finalOutput)
 }   
}

printNum()

output
   1
  1 2
 1 2 3
1 2 3 4

function printNum(){
 for(let i=1; i<=4; i++){
     let finalOutput = '';
     for (let k=1; k<=4-i;k++){
         finalOutput += " "
     }
     for(let j=1; j<=i; j++){
         finalOutput += i + " "
     }
     console.log(finalOutput)
 }   
}

printNum()

output
   1
  2 2
 3 3 3
4 4 4 4

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