Question

我想创建一个以数组作为参数的函数，从1 - 10创建一个随机数，并运行直到它创建一个不在数组中的数字，并返回它。

＆＃13;

function contains() {
  var check = false;
  while (!check) {
    var random = Math.floor(Math.random() * 10);
    random += 1;
    for (var i = 0; i < arr.length; i++) {
      if (arr[i] === random) {
        console.log(random);
        check = false;
        return false;
      }
    }
    check = true;
    console.log(random);
    return true;
  }
}

var arr = [1, 2, 3, 4, 5, 6];

$(".test").on("click", function() {
  contains(arr);
});

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button class="test">
Test
</button>

＆＃13;

Answer 1

使用.includes Array方法查看数组中是否存在值：

https://jsfiddle.net/an3ogr34/8/

function contains(arrParam) {
  while (true) {
    var random = 1 + Math.floor(Math.random() * 10);
    if (!arrParam.includes(random)) return random;
  }
}

var arr = [1, 2, 3, 4, 5, 6];
$(".test").on("click", function() {
  const result = contains(arr);
  console.log(result);
});

Answer 2

多重错误

arr

contains被contains函数使用。 arr函数无法访问全局true

您同时返回false和random，即使arr中包含contains项， function contains() { var check = false; while (!check) { var random = Math.floor(Math.random() * 10); check = !arr.includes(random); } return random; }从函数返回。

成功

function contains() {
  var check = false;
  while (!check) {
    var random = Math.floor(Math.random() * 10);
    check = !arr.includes(random);
  }
  return random;
}

var arr = [1, 2, 3, 4, 5, 6];

$(".test").on("click", function() {
  console.log(contains());
});

<强>演示

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>


<button class="test">
Test
</button>

import pandas as pd

d = {'A': ['a1','a1','a2'], 'B': ['b1','b2','b3'], 'C': ['c1','c2','c2'], 'v': [0,5,1]}
df = pd.DataFrame(data=d)

df = df.set_index(['A','B','C'])

for i in set(df.index):
    df_sel = df.loc[i].reset_index()
    df_sel = df_sel.T #or any other operation on dataframe
    df_sel.to_csv(str(i) + '.csv')

Answer 3

您可以使用do ... while循环，因为您需要至少一个循环来检查随机数，并检查Array#includes是否继续循环。

不要忘记移交数组以检查并在函数内部使用该数组。

function contains(array) {
    var random;
    
    do {
        random = Math.floor(Math.random() * 10) + 1;
    } while (array.includes(random))

    return random;
}

var numbers = [1, 2, 3, 4, 5, 6];

console.log(contains(numbers));

Answer 4

我使用indexOf()

提出了解决方案

var arr = [1, 2, 3, 4, 5, 6];

function contains() {
  var randomNumber = Math.floor((Math.random() * 10) + 1);
  if (arr.indexOf(randomNumber) === -1) {
    return randomNumber;
  } else {
    console.log(`Number exists: ${randomNumber}`);
  }
}

$(".test").on("click", function() {
  var returnNumber = contains();
  if (!!returnNumber) {
    console.log(`Number not exists: ${returnNumber}`);
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button class="test">
Test
</button>

Answer 5

function contains(arr) {

    if(arr.length<10){
        while(true){
            var random = Math.floor(Math.random() * 10);
            random += 1;

            if(!arr.includes(random)){
                return random;
            }
        }
    }
    return -1;
}

var arr = [1, 2, 3, 4, 5, 6];

$(".test").on("click", function () {
    console.log(contains(arr));  //for print in console
    contains(arr);
});

只返回不在数组中的随机数

5 个答案: