How to express the sum of factorials of 1!+2!+……+10! in JavaScript

In JavaScript, you can use a for loop with the "*", "<=" and "=" operators to calculate the factorial sum from 1 to 10. The syntax is "var count=0;var a= 1;for(var i=1;i<=10;i ){a=a*i;count =a;}".

The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.

How to express the sum of 1! 2!... 10! in javascript

The for loop is a tool that you often use when you want to create a loop.

The following is the syntax of a for loop:

for (语句 1; 语句 2; 语句 3)
{
    被执行的代码块
}

Statement 1 (code block) is executed before starting

Statement 2 defines the conditions for running the loop (code block)

Statement 3 is executed after the loop (code block) has been executed

The example is as follows:

 // 计算1到10的每一个数字的阶乘之和
 // 阶乘： 5! = 1 * 2 * 3 * 4 * 5; 8! = 1 * 2 * 3 * ... * 7 * 8;
 // 定义变量用来累加
 <script>
 var count = 0;
 for (var i = 1; i <= 10; i++) {
 // 定义变量计算当前数的阶乘
 var jc = 1;
              for (var j = 1; j <= i; j++) {
                  jc *= j;
              }
              console.log(i + "的阶乘是" + jc);
              count += jc;
          }
          console.log("1 ~ 10的阶乘的总和是" + count);
         // 第二种
          var count = 0;
          var a = 1;
          for (var i = 1; i <= 10; i++) {
              a = a * i;
              count += a;
          }
          console.log("1 ~ 10的阶乘的总和是" + count);
        </script>

Both methods in the above example can calculate the factorial of 1 to 10 as 4037913.

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