javascript之高级数组api Javascript之高级数组API的使用实例（javascript数组方法有哪些）

<script>
fn(1,2);
  fn(1,2,3,4,5,6);
  fn(1,2,4,5,7,9,4);
  function fn(a,b){
  arguments[0]=0;
  console.log(arguments);
  arguments.push(1);
  console.log(arguments instanceof Array);
  console.log(arguments.length);//实参个数
  console.log(fn.length);//形参个数
  console.log(arguments.callee);//整个函数,包括注释
  }
</script>

<script>
var arr=["刘备","张飞","关羽"];
var str=arr[0];
for(var i=1;i<arr.length;i++){
  str+="|"+arr[i];
}
console.log(str);
</script>

<script>
var arr=["刘备","张飞","关羽"];
var str=arr.join("|");
console.log(str);
</script>

<script>
var str1=["a","b","c","d"];
var str2=[];
for(var i=0;i<str1.length;i++){
  str2[str1.length-i-1]=str1[i];
}
console.log(str2);
</script>

<script>
var str1=["a","b","c","d"];
console.log(str1.reverse());
</script>

<script>
var arr=[1500,1200,2000,2100,1800];
var arr1=arr.filter(function(element,index,array){
  if(element<=2000){
    return true;
  }
  return false;
})
console.log(arr1);
</script>

<script>
var arr=["c","a","z","a","x","a"];
var json={};
for(var i=0;i<arr.length;i++){
    if(json[arr[i]]!==undefined){
      json[arr[i]]+=1;
    }else{
      json[arr[i]]=1;
    }
}
console.log(json);
</script>

<script>
var arr=[3,2,4,5,5,3,5,568,4,21,7];
var arr1=fn(arr);
function fn(array){
  var arr2=[];
  arr2.push(array[0]);
  abc:for(var i=0;i<array.length;i++){
    for(var j=0;j<arr2.length;j++){
      if(arr2[j]==array[i]){
        continue abc;
      }
    }
    arr2.push(array[i]);
  }
  return arr2;
}
console.log(arr1);
</script>

<script>
var arr=[1,2,3,4,5,2,3,4];
console.log(arr);
console.log(fn(arr));
function fn(array){
  var newArr=[];
  for(var i=0;i<array.length;i++){
    var bool=true;
    for(var j=0;j<newArr.length;j++){
      if(array[i]===newArr[j]){
        bool=false;
      }
    }
    if(bool){
      newArr[newArr.length]=array[i];
    }
  }
  return newArr;
}
</script>