搜索到
146
篇与
的结果
-
61、函数的返回值 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> function getTotalprice(x, y){ return x + y //不能换行 // return 后面的代码不会被执行 } let sum = getTotalprice(1, 2) console.log(sum) console.log(sum) </script> </body> </html> -
60、实参可以是变量 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // 求n~m的累加和 function getSum(n = 0,m = 0){ let sum = 0 for(let i = n; i <= m; i++){ sum += i } console.log(sum) } // getSum() let num1 = +prompt('请输入起始值：') let num2 = +prompt('请输入结束值：') // 调用函数 getSum(num1,num2) //实参可以是变量 </script> </body> </html>
-
59、函数封装求和案例 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // 1、封装函数 // 给一个参数的默认值 function getArrSum(arr) { // console.log(arr) let sum = 0 for(let i = 0; i < arr.length; i++){ sum += arr[i] } console.log(sum) } getArrSum([1,2,3,4,5]) getArrSum([11,22,33,44,55]) </script> </body> </html>
-
58、函数参数-默认参数 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // // 函数求和 // function getSum(num1 = 0, num2 = 0){ // // num1 默认的值 undefined // document.write(num1 + num2) // } // getSum(1, 2) function getSum(start, end){ //end等于50 // 形参 形式上的参数 // console.log(end) let sum = 0 for (let i = start; i <= end; i++){ sum += i } console.log(sum) } getSum(1, 50) //1~50 // 调用的小括号里面 实参-实际的参数 getSum(100, 200) //1~100 // 实参-实际的参数 // </script> </body> </html>
-
57、函数封装案例 copy <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // 1、求2个数的和 // function getSum(){ // let num1 = +prompt('请输入第一个数') // let num2 = +prompt('请输入第二个数') // console.log(num1 + num2) // } // getSum() // 2、求1~100之间所有数的和 function getSum(){ let sum = 0 for (let i = 1; i <= 100; i++){ sum += i } console.log(sum) } getSum() </script> </body> </html>
