题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
let arr = readline().split('')
let str = ''
arr.forEach(item=>{
if(str.indexOf(item)=== -1){
str += item
}
})
console.log(str.length)
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
let arr = readline().split('')
let str = ''
arr.forEach(item=>{
if(str.indexOf(item)=== -1){
str += item
}
})
console.log(str.length)
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