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String + array deduplication practical case analysis

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Release： 2018-06-06 17:48:36
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This time I will bring you a practical case analysis of string and array deduplication. What are the precautions for string and array deduplication? The following is a practical case. Let’s take a look. 

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title> js数组、字符串去重</title>
</head>
<body>
  <script type="text/javascript">
  /*数组去重*/
    function quchong(arr){
      var len = arr.length;
      arr.sort();
      for(var i=len-1;i>0;i--){
        if(arr[i]==arr[i-1]){
          arr.splice(i,1);
        }
      }
      return arr;
    }
    var a = ["a","a","b",'b','c','c','a','d'];
    var b = quchong(a);
    console.log(b);
  /*字符串去重*/
  function quchongstr(str){
    var a = str.match(/\S+/g);//等价于str.split(/\s+/g)// \s空白符，\S非空白符
    a.sort();
    for(var i=a.length-1;i>0;i--){
      if(a[i]==a[i-1]){
        a.splice(i,1);
      }
    }
    return a.join(" ");
  }
  var str = quchongstr("a a b a b e");
  console.log(str);
  </script>
</body>
</html>
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js Array deduplication
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