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JS implements statistics on data patterns within strings

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Release： 2018-06-05 09:19:51
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This time I will bring you JS implementation statisticsStringData patterns within strings, JS statistics string data patternsWhat are the precautionsThe following is a practical case, let's come together take a look.

js determines the number of occurrences of a certain character in a string

The question I encountered today is relatively simple. In order to avoid being overly ambitious, let’s write it down

<html>
<head>
<meta charset="utf-8" />
<title> js判断字符串中某字符出现的个数</title>
</head>
<body>
<script>
  var testStr = 'aoifhoiwehfoiweiwadakl';
  var i;
  var tempObj = {};
  for (i = 0; i < testStr.length; i++) {
    var charAt = testStr.charAt(i);//相当于挨个遍历字符串字符，将字符作为key,出现的次数作为value类似java中的map
    if (tempObj[charAt]) {
      tempObj[charAt]++;
    } else {
      tempObj[charAt] = 1;
    }
  }
  console.log(tempObj);
//循环遍历找到最大数
  var max = 0;//初始化一个最大数
  var maxStr;
  var obj;
  for (obj in tempObj) {
    if (tempObj[obj] > max) {
      max = tempObj[obj];
      maxStr = obj;
    }
  }
  console.log(maxStr + ':' + max);
</script>
</body>
</html>
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