Course Intermediate 11330
Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.
Course Advanced 17632
Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.
Course Advanced 11346
Course Introduction："Brothers Band Front-end Example Display Video Tutorial" introduces examples of HTML5 and CSS3 technologies to everyone, so that everyone can become more proficient in using HTML5 and CSS3.
2017-06-28 09:27:53 0 4 1451
java - How to modify mybatis if it exists in the database, and add if it does not exist
2017-05-17 10:04:15 0 3 598
In JavaScript, except for NaN, are all other variables equal to itself?
2017-07-05 10:50:13 0 4 1441
Determine whether the input is a number
def is_number(s): try: float(s) return True except ValueError: pass try:
2022-05-13 23:04:37 0 0 1091
Why can't I open it using www.myphp?
2018-02-11 20:37:58 0 4 1292
Course Introduction：PHP determines the character type: PHP determines the character type PHP determines whether the value is an integer: // is_numeric detects whether the variable is a number or a numeric string if(is_numeric($intPoints) === TRUE && (int)$intPoints == $intPoints){ echo "This is an integer"; }else{echo "Not an integer"; }').addClass('pre-numbering').hide();$(this).addClass('has-numbering').p
2016-07-29 comment 0 1773
Course Introduction：How to determine whether a string is an integer in Java: 1. Use the isDigit function to determine whether the characters in the string are all numbers. 2. Use the regular expression "[0-9]*" or "^-?[0-9]+" (can judge negative numbers) to judge.
2019-11-22 comment 0 5400
Course Introduction：The way PHP determines whether a number is an integer is to use the is_int function to determine and take the number to be determined as a parameter, such as [is_int($var_name1)].
2021-06-18 comment 0 3344
Course Introduction：How to determine whether a string is an integer in Java: 1. Use the isDigit() function to determine whether all characters in the string are numbers. 2. Use regular expressions to judge. 3. Determine whether the string is an integer by using the ASCII codes of all characters in the string.
2019-12-16 comment 0 3036
Course Introduction：Two judgment methods: 1. Use is_numeric() and strpos() to judge whether the string is a numeric string that does not contain a decimal point. The syntax is "!is_numeric($str)||strpos($str,".")!== false", if false is returned, it is an integer string, and vice versa. 2. Use intval() to convert the string into an integer value, and use the "==" operator to determine whether the integer value is equal to the original string. The syntax is "intval($str)==$str".
2023-01-17 comment 0 1944
