Method: 1. Use the var statement to declare a variable with a value of 1; 2. Use a for loop with the "
The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.
How to write a javascript program to calculate the factorial of 9
To write a JavaScript program to calculate the factorial of 9, you can use a for loop.
It is necessary to traverse the numbers 1~9, so the initial condition of the for loop can be set to i = 1, and the restriction condition can be i
Then in the loop body "{}", multiply the i values of each loop.
The example is as follows:
<html>
<body>
<p>点击按钮循求9的阶乘。</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
var cj = 1;
for (var i = 1; i <= 9; i++) {
cj *= i;
}
document.getElementById("demo").innerHTML = cj;
}
</script>
</body>
</html>Output result:
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