统计字符出现次数
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<title>Document</title>
</head>
<body>
<script>
var str = "abcabcabbbbbbbbbbbb"
var obj = {}
for(var i=0;i<str.length;i++){
console.log(str[i])
var key = str[i]
if(obj[key]){
obj[key]++
}else{
obj[key] = 1
}
}
console.log(obj)
</script>
</body>
</html>
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