Author: Mr. Liu Shangyuan
- Give no less than any effort
- May all our efforts be lived up to
- Never forget why you started, and your mission can be accomplished.
I didn't miss you very deliberately
Because I know
We should be grateful when we meet
You need to let go when you pass by
I'm just in a lot of little moments
Think of you
Like a movie
A song
A Lyric
A road
and
Countless closed eyes moments
If I don't meet you
Will I have another life?
With or without results
I would rather meet you
Zhang Xiaoxian
<!DOCTYPE html> <!-- Document type: Standard html File --> <html lang='en'> <!-- html Root tag translation text: English --> <head> <!-- Webpage header --> <meat charset='UTF-8'/> <!-- Web page character encoding --> <meat name='Keywords' content='Keywords 1,Keywords 2'/> <meat name='Description' content='Website description'/> <meat name='Author' content='author'/> <title>Front end 59 student assignments</title> <!-- Webpage title --> <link rel='stylesheet' type='text/css' href='css/css1.css'/> <!-- Chain style sheet --> <style type='text/css'> /*Internal style sheet*/ </style> </head> <body> <!-- Web backbone: visualization area --> <script> /* Numerical method: Number */ // es6 extension, judgment Number.isFinite(9); // Determine whether the value is limited and return the Boolean value Number.isNaN(papa); // Judge whether the value is a number and return a Boolean value Number.isInteger(25.0); // Judge whether the value is an integer and return a Boolean value // Number rounding, floating point parseInt("12.34"); // 12 rounding parseFloat("12.34aaa"); // 12.34 floating point number /* Math: Mathematical object Mostly mathematical */ // PI Math.PI; // Rounding up and down let num = 1.2; Math.ceil(num); // 2 round up Math.floor(num); // 1 round down Math.round(num); // 1 rounding // Maximum, minimum Math.max(1, 5, 3, 9, 7); // 9 return to maximum Math.min(1, 5, 3, 9, 7); // 1 return to minimum // Secondary power Math.pow(10, 2); // 100 is equivalent to 10 * * 2 // Cube root Math.cbrt(8); // 2 // Square root of sum of squares of all values Math.hypot(3, 4); // 5 // es7 extension, exponential operator 10 ** 2; // 100; b **= 3; // Equivalent to b = b * b * b // Random value Math.random( ); // [0, 1) the random value between 0 and 1 may be taken as 0, and will never be taken as 1 // Random value method function fn(a, b){ return Math.floor(Math.random( ) * ((b + 1) - a) + a); } fn(1, 9); // Decimals removed Math.trunc(3.8); // 3 // Judge whether the value is positive, negative, zero Math.sign(5); // +1 returns five values, positive (+ 1), negative (- 1), 0 (0), - 0 (- 0), other values (NaN) /* Timer: One time timer Periodic timer Asynchronous operation */ // One time timer, one time execution is over setTimeout(What to do (usually a function), Time interval (MS), Arguments to callback functions); // Periodic timer, executed once in a while setInterval(What to do (usually a function), Time interval (MS), Arguments to callback functions); // Clear timer clearTimeout(The name of a timer or of a timer id); // Clear setTimeout clearInterval(The name of a timer or its id); // Clear setInterval // Example let timer = setInterval(function (){ alert("Sting"); }, 500); clearInterval(1); // Use the id value of timer to clear clearInterval(a); // Use variable names to clear recommendations </script> </body> </html>