How to count the number of occurrences of each character in a string using js?

How to use js to count the number of occurrences of each character in a string?

JS method of counting the number of occurrences of each character in a string:

<script>
 
/*这个字符串中的每个字每出现了多少次*/
var ary = "asasDFGHadDfFFhjkMNJGBHGDsdfghjfghjkdfghjkl";
var obj = {};
var i = 0;
 
ary1 = ary.toLocaleLowerCase(); //将字符串转为小写
 
for(i = 0; i < ary1.length; i++)
{
key = ary1[i];
 
if(obj[key])
{
//对象中有这个字母
obj[key]++;
}
else
{
//对象中没有这个字母,把字母加到对象中
obj[key] = 1;
}
}
 
for(var key in obj) //遍历这个对象
{
console.log(key + "这个字母出现了" + obj[key] + "次");
}
</script>

Running results:

Recommended tutorial: "javascript basic tutorial"

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