What you don't know about JS usage tips

Tidy up some of the JavaScript some of the practical skills, maybe you can save a lot of development time, quickly collect it!

• Five-point scoring system

   /*   Five-point scoring system  */ function   getrating ( Rating) { if  (Rating > 5 | | rating < 0) th    Row  new  Error ("number is not in range"  return  "★★★★★☆☆☆☆☆". Substring (5-rating, 10-  rating);}  //  call method and result of execution  getrating (3); //  result: ★★★☆☆    

• Produces a string of n identical characters stitched together

  /* generate index of the same STR string */ function Create_str (index,str) {    returnnew Array (index + 1). Join (str);} // call method and execution result create_str (2, "abc")// result: Abcabc

• Multi-line string

• /* The first is a     newline through a backslash */var str = "console.log (123)    Console.log (123)    Console.log (123)    Console.log (123)    Console.log (123)";

  /* the second    way to pass the function */ var str = (function  (    ) {/* *        Console.log (123)        Console.log (123)        Console.log (123)        Console.log (123)    **/ }). toString (). Split ("* *") [1];

  /* Third Kind */ var str = "Console.log (123)" +    "Console.log (123)" +    "Console.log (123)" + "    Console.log (123) ";

• Quickly generate an array of values that increment sequentially

  Array.apply (nullnew Array). Map (function(item, index) {  return Index + 1;}); // ES6 Syntax Array.from (Array (+), (v, i) = = i);

• Hijacking function

  function (s) {    if (Confirm ("Do you want to play the box, the content is" + S + "?) ") {        alert (s);    }};

• Quickly convert other data types to number types

  Console.log (typeof + "1"); // number Console.log (typeof +new Date ())// number

• Rounding and turning into numerical

  /* directly after the decimal point is removed, cannot be rounded */ ("10.567890" | |) // Ten    number

• Get random Codes

  // 14-bit random code // 11-bit random code

• Gets the maximum minimum value in the array

  Math.min.apply (math,[1,2,3,4,5,6])// Get minimum value Math.max.apply (math,[1,2,3,4,5,6])//  Get minimum Value

Original source: https://www.meetqy.com/article?article_id=44

What you don't know about JS usage tips