JS_ECMA small functions of several packages in basic syntax-1

Today, we introduce the small functions of several packages in JS ECMA and some common function cases.

1, find the duplicate function

<script>        //Find duplicates inside the array,        function Findinarr (N,arr) {for            (var i=0; i< arr.length; i++) {                if (arr[i ]==n) {                    return true;                }            }            return false;        }    </script>

2 Random number function

<script>        function rnd (n,m) {            return parseint (Math.random () * (m-n) +n)        }    </script>

3 function of zero complement

<script>        function Addzero (n) {            return n<10? ' 0 ' +n: ' +n;        }    </script>

4 summation

<script>        function sum () {            var res=0;            for (Var i=0;i<arguments.length;i++) {                res+=arguments[i];            }            return res;        }        Alert (sum (1,2,5,7,9))    </script>

5 Gets the non-inline style function. html

<script>        function GetStyle (obj,attr) {            if (obj.currentstyle) {                return obj.currentstyle[attr];            } else{                return getComputedStyle (Obj,false) [attr];            }        }    </script>

Here are a few more examples of how to use them

1 Color Ball

<! DOCTYPE html>
 2 full upgrade (similar to the effect of a shopping cart) 
 
<! DOCTYPE html>
3 Upgraded version of the tab
<! DOCTYPE Html>"en"> <meta charset="UTF-8"> <title></title> <script>window.onload=function () {varObtn=document.getelementbyid ('btn'); varAinput=document.getelementsbytagname ('input'); varinow=0; Obtn.onclick=function () { for(varI=1; i<ainput.length;i++){                     if(OBTN.checked==true) {Ainput[i].checked=true; Inow=ainput.length-1; }Else{ainput[i].checked=false; Inow=0; }} document.title=Inow;            };  for(varI=1; i<ainput.length;i++) {Ainput[i].onclick=function () {if( This.checked==true) {Inow++; }Else{Inow--; } document.title=Inow; if(inow==ainput.length-1) {obtn.checked=true; }Else{obtn.checked=false; }                }            }        }    </script>"checkbox"Name=""Id="btn"/>"checkbox"Name=""Id=""/><input type="checkbox"Name=""Id=""/><input type="checkbox"Name=""Id=""/><input type="checkbox"Name=""Id=""/><input type="checkbox"Name=""Id=""/><input type="checkbox"Name=""Id=""/><input type="checkbox"Name=""Id=""/></body>
All right, let's share it with you today, and we'll continue to share other small methods and functions for you tomorrow.
　
Never too old to learn.
　　
　　
　　
　　
　　
JS_ECMA small functions of several packages in basic syntax-1