JavaScript programming problem
Enter a year (authentication required), it is determined whether the page is a leap year (year divisible by four, not be divisible by 100; divisible by 400 is a leap year), and displays the corresponding message on the page.
<! DOCTYPE HTML>
<HTML>
<head>
<title> leap </ title>
<Meta charset = "UTF-. 8">
</ head>
<body>
<form>
enter year: <INPUT ID = "year" = type "text" />
<span ID = "Check"> </ span>
</ form>
<Script> var INPUT = document.getElementById ( "year" );
var Tip = document.getElementById ( "Check" );
// input box loses focus trigger event
input.onblur = function() {
var year = input.value.trim();
//
Digit number by a 4 year
IF (/ ^ \ {D} $ 4 / .test (year)) {
// can not be divisible by 4 year divisible by 100; leap year is divisible by 400
IF ((year% ! year. 4 == 0 && 0 = 100%) || (400% year == 0 )) {
tip.innerHTML = "leap" ;
} the else {
tip.innerHTML = "non-leap" ;
}
} the else {
Tip. the innerHTML = "year format is not correctly re-enter" ;
}
}
</ Script>
</ body>
</ HTML>
MySQL quiz
How MySQL login prompt command? How to list all the databases? How to switch to a database and work on it? How to list all the tables in a database? How to get the name and type of all Field objects in the table?
1. mysql -u -p 2. show databases; 3. use dbname; 4. show tables; 5. describe table_name ;
Java programming problem
If a number is exactly equal to the sum of its factors, this number is called a "complete count." For example 6=1＋2＋3Programming number to find all finished within 1000.
Package Test; / ** * Number End Analyzing * @author the CUI * / public class TL5 { / ** * is determined whether the number of finished * @param number a required determination * @return Boolean * / public static Boolean Test ( int a ) { int Cup = 0 ; // loop through, to find all of the factors, and calculating the sum factor for ( int I =. 1; I <A; I ++ ) { IF (A% I == 0 ) Cup = Cup + I; } return (cup == a); } public static void main(String[] args) { String str = ""; for (int i = 1; i < 1000; i++) { if (test(i)) { str += i + ","; } } System.out.print(str.substring(0, str.length() - 1)); } }