String, array method combat--charat (), Split (), indexOf (), substring ()

This essay is based on two questions to combat some of the methods of arrays and strings.

Question one: Find out the most occurrences of the number of characters in a string

1 varstr = ' Fuuhuhuhufaihuhfnkjnkcnio ';?2     functionnum (str) {3         varJSON = {};4          for(vari = 0; i < str.length; i++){5             //the Charat () method of the string returns the string at the specified position6             if(!json[str.charat (i)]) {//assigns a value of 1 to the current property if there is no current property in the JSON object7Json[str.charat (i)] = 1;8}Else{9Json[str.charat (i)]++;//if the current property is already present in the JSON object, the current property value +1Ten             } One         } A         varIMax = 0; -         varIIndex = ' '; -          for(varIinchJSON) {//for in iterates over the properties of a JSON object the             if(json[i]>IMax) { -IMax =Json[i]; -IIndex =i; -             } +         } -Console.log (' Most occurrences are: ' +iindex+ ' appears ' +imax+ '); +     } ANum (str);

Question two: Output the value of the corresponding string

Specific description: Given a URL string, such as var url="http://www.baidu.com/?username=xiaohua&password=262763"; When we enter username, the value of the output username

Method One

1  varUrl= "http://www.baidu.com/?username=xiaohua&password=262763";2     functionUrle (key) {3         varValue= "";4         varCC = Url.split ('? ') [1].split (' & '));5          for(vari=0;i<cc.length;i++){6             varR =Cc[i];7             varA = r.split (' = '));8             if(key==a[0]){9Value = a[1];Ten                  Break; One             } A         } -         returnvalue; -     } theConsole.log (Urle (' username '));//Xiaohua

Url.split ('? ') Convert the URL string to an array: ["http://www.baidu.com/", "username=xiaohua&password=262763"], now the original string '? ' The following string is extracted and then converted to the array code, such as line fourth

Method Two

1 functionUrle (key) {2         varValue = "";3         varAA = Url.indexof ('? '));4         varbb = url.substring (aa+1);5         varCC = Bb.split (' & '));6          for(vari=0;i<cc.length;i++){7             varR =Cc[i];8             varA = r.split (' = '));9             if(key==a[0]){TenValue = a[1]; One                  Break; A             } -         } -         returnvalue; the     } -Console.log (Urle (' username '));//Xiaohua

String, array method combat--charat (), Split (), indexOf (), substring ()