前端 JS快速字符串快速去重 - 戴向天

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	function removeDuplicateChar(str){
			if(!str)return ''
			str = str.toString()
			for(let i=0;i < str.length;i++){
				let charStr = str[i]
				let okStr = str.substring(0,i+1)
				let surplus = str.substring(i+1,str.length)
				surplus = surplus.replace(new RegExp('\\'+charStr, "gm"), '');
				str  = okStr + surplus
			}
			return str
		}
		const strOne = "aaaaaaaaabbbababababababbacdjkabacdjkabacdjkabacdjkaaaergds"
		console.log(strOne)
		console.log(removeDuplicateChar(strOne))

方法二：

const str = 'aaaabbbbccccadfyabfnsldnfas;';
str.split('').reduce((a,s)=>{
 	(a.indexOf(s)<0&&a.push(s));
 	return a
 },[]).join('')