51 lines
1.3 KiB
HTML
51 lines
1.3 KiB
HTML
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<!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>递归和杨辉三角</title>
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</head>
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<body>
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<button onclick="ljq()">点我加一</button>
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<p></p>
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<script>
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function combine (m, n) {
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if (n == 0) {
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return 1;
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} else if (m == n) {
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return 1;
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} else {
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return combine(m - 1, n) + combine(m - 1, n - 1);
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}
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}
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function put (len) {
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for (let i = 0; i < len; i++) {
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for (let j = 0; j <= i; j++) {
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document.write(combine(i, j) + ' ');
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}
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document.write('<br/>');
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}
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}
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put(5);
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function add(){
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var count = 0;
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function demo(){
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count ++;
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console.log("现在的值："+count);
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}
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return demo;
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}
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var counter = add();
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function ljq(){counter(); }
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// 目的：从全局访问add里面的count变量
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// 点击调用ljq -> counter-> counter=demo->demo() -> 输出结果
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</script>
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</body>
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</html>
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