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输入一个字符串，统计该字符串中每个字符出现的次数
var str = "aabbccddeeef";
var strNew = {};创建一个空的对象
for(var i=0; i<str.length; i++){
var num = str[i];
if (!strNew[num]) {
strNew[num] = 1;
}else {
strNew[num] += 1;
}
}
console.log(strNew);
</script>