Common actions for JavaScript to handle strings

Given a string, for example: "abaasdffggghhjjkkgfddsssss3444343";

1, the byte length of the string

Reference code:

document.write (txt.length+ "<br/>");d ocument.write ("<br/>");

2. Remove the characters from the specified position, such as: 0,3,5,9, etc.

Reference code:

for (Var i=0;i<txt.length;i++) {    if (i==0 | | i==3 | | i==5 | | i==9) {        document.write ("The position is" +i+ "character is:" +txt.substr ( i,1) + "<br/>");}    } document.write ("<br/>");

3. Find out whether the specified character exists in the above string, such as: I,c, B, etc.

Reference code:

if (Txt.indexof ("I")!=-1) {    document.write ("I exist in string <br/>");} else{    document.write ("I do not exist in string <br/>");} if (Txt.indexof ("C")!=-1) {    document.write ("C exists in string <br/>");} else{    document.write ("C does not exist in string <br/>");} if (Txt.indexof ("B")!=-1) {    document.write ("b exists in string <br/>");} else{    document.write ("B does not exist in string <br/>");}

4, replace the specified characters, such as: g Replace with 22,SS to replace with B and other methods of operation

Reference code:

document.write (TXT); var txtreg=/[g]/g;  The use of regular expressions Var txtvalue=txt.replace (Txtreg, "a");d ocument.write ("<br/>");d ocument.write (txtvalue); document.write ("<br/>");d ocument.write ("<br/>");d ocument.write (TXT); var txtreg=/[s]{2}/g;var Txtvalue=txt.replace (Txtreg, "B");d Ocument.write ("<br/>");d ocument.write (txtvalue);d ocument.write ("<br /> ");

5. Find the most occurrences of the characters in the above string and the number of occurrences

Reference code:

var json = {};for (var i=0;i<txt.length;i++) {    if (!json[txt.charat (i)]) {        Json[txt.charat (i)] = 1;    } else {        Json[txt.charat (i)]++;    }} var char= '; var num=0;for (var key in JSON) {    if (json[key]>num) {        char = key;        num = Json[key];}    } document.write (txt+ "The most occurrences of the character is" +char+ "and the number of times is:" +num);

Common actions for JavaScript to handle strings