39 lines
939 B
HTML
39 lines
939 B
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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<script>
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// 递归 就是在函数内 调用自身
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// 阶乘的函数
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// 5的阶乘 = 5*4*3*2*1
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// n的阶乘 = n*（n-1）*(n-2)*(n-3)...*1
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// n*(n-1)*(n-1-1)*(n-1-1-1)*(n-1-1-1-1)....*1
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function jc(n){
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if(n==1){
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return 1;
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}else{
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return n*jc(n-1)
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}
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}
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// 4
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// 4*jc(4-1) 4*jc(3)
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// 4*jc(3) 4*3*jc(3-1)
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// 4*3*jc(2)
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// 4*3*2*jc(2-1)
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// 4*3*2*jc(1)
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// 4*3*2*1
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var jiecheng=jc
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jc=null
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var res=jiecheng(5)
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console.log(res)
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</script>
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</head>
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<body>
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</body>
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</html> |