<script type= "Text/javascript" > var str = "ADADFDFSEFFSERFEFSEFSEEFFFFFTSDG"; Name a variable to place the given string var maxLength = 0; Name a variable to place the highest number of letters appearing and initialize to 0 var result = '; Name a variable drop result input while (str!= ') {//loop iteration start, and determine whether the string is empty oldstr = str;//Assign the original string variable to the new variable getstr = STR.SUBSTR (0 , 1); Gets the first character (first letter) eval ("str = str.replace (/" +getstr+ "/g, ')" by the Substr method of the string); Details such as supplemental if (Oldstr.length-str.length > MaxLength) {//Determine the length of the original string minus whether the replacement string length is greater than the maximum length of the string before it appears maxlengt h = oldstr.length-str.length; Double string length subtraction get maximum string length result = getstr + "=" + maxLength//return maximum string results (Letters, occurrences)} alert (Result)//Popup results </script>
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eval ("str = str.replace (/" +getstr+ "/g, ')");
Many people may want to write str = str.replace (/getstr/g, "), but the result is a mistake. Why, in this sentence, the expression matches the Getstr string, not the first letter that the getstr points to. The Eval method avoids (first getstr gets the first letter, the string is concatenated with "str = str.replace (/" +getstr+ "/g,") "and finally executes the code in the Eval, which is: First, explain the JavaScript code, And then execute it again).
Eval performance is bad, error prone, and not readable. It is recommended that eval ("str = str.replace (/" +getstr+ "/g,") be changed to:
str = str.replace (new RegExp (Getstr, "G"), "")
