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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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