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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+ <meta charset="UTF-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
+ <title>Document</title>
+</head>
+<body>
+ <script>
+ var num = window.prompt("请输入一个数字")*1;
+ console.log(Math.pow(num,2));
+ console.log(Math.sqrt(num));
+ console.log(Math.log(num));
+ </script>
+</body>
+</html>
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+ var num = Math.random();
+ num = num * 101;
+ num = Math.floor(num);
+ console.log(num);
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+ var day = new Date();
+ var year = day.getFullYear();//获取当前年份
+ var month = day.getMonth() + 1;//获取当前月份
+ var date = day.getDate();//获取当前日
+ var week = day.getDay();//获取当前星期
+ var hour = day.getHours();//获取当前小时
+ var minute = day.getMinutes();//获取当前分钟
+ var second = day.getSeconds();//获取当前秒
+ var str = "现在是"+year + "年" + month + "月" + date + "日" + hour + ":" + minute + ":" + second;
+ // var weekArr = ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"];
+ // str += weekArr[week];
+ str += "星期" + "日一二三四五六".charAt(week);
+ document.write(str);
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+ function CollectDigits(str) {
+ var arr = str.split("");
+ // console.log(arr);
+ var res = "";
+ for (var i = 0; i < arr.length; i++) {
+ if (arr[i] >= '0' && arr[i] <= '9') {
+ res += arr[i];
+ }
+ return res;
+ console.log(CollectDigits("a2s4d7"));
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+ var str1 = "123456";
+ var str2 = "abc";
+ // 1a2b3c456
+ function Merge(a,b){
+ var arr1 = a.split("");
+ var arr2 = b.split("");
+ var min = Math.min(arr1.length,arr2.length);
+ var res = [];
+ for(var i=0;i<min;i++){
+ res.push(arr1[i]);
+ res.push(arr2[i]);
+ var maxArr = arr1.length>arr2.length?arr1:arr2;
+ res = res.concat(maxArr.slice(min))
+ return res.join("");
+ console.log(Merge(str1,str2));
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+ var arr = [70,80,90,45,60,78,100];
+ var sum = 0;
+ var arr2 = [];
+ for(var i=0;i<arr.length;i++){
+ sum += arr[i];
+ if(arr[i]<60){
+ arr2.push(arr[i]);
+ var avg = sum/7;
+ console.log(avg,sum,arr2);
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+ function Fibonacci(n){
+ var arr = [1,1];
+ if(n>2){
+ for(var i=2;i<n;i++){
+ arr.push(arr[i-1]+arr[i-2]);
+ return arr;
+ var res = Fibonacci(40);
+ res = res.reverse();
+ console.log(res);
+ for(var i=0;i<res.length;i++){
+ document.write(res[i]);
+ document.write(" ");
+ if((i+1)%6==0){
+ document.write("<br>");
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+ // 判断闰年
+ function foo(a){
+ if(a % 4 ==0 && a % 100 != 0 || a % 400 == 0){
+ return true;
+ }else{
+ return false;
+ // var day = new Date();
+ // var year = day.getFullYear();
+ // var month = day.getMonth() + 1;
+ // var date = day.getDate();
+ function foo2(x,y,z){
+ var monthArr = [31,28,31,30,31,30,31,31,30,31,30,31];
+ // 判断是否是闰年 如果为闰年 2月份为29天
+ if(foo(x)){
+ monthArr[1] = 29;
+ // 计算天数
+ var sumDay = 0;
+ for(var i=0;i<y-1;i++){
+ sumDay += monthArr[i];
+ sumDay += z;
+ return sumDay;
+ console.log(foo2(2025,4,10))