Javascript 数组之判断取值和数组取值

function fn1(){
    for(var i=0;i<arr.length;i++){
     if(typeof arr[i] === ‘number‘ &&  arr[i] === arr[i]){
         alert(arr[i]); //-98765, 34, -2, 0, 5
    }
  }
}

fn1();

var arr2 = [];
function fn1(){
    for(var i=0;i<arr.length;i++){
     if(!isNaN(parseInt(arr[i]))){
          arr2.push(arr[i]); //是数字的： 100px, -98765, 34, -2, 0, 300, 23.45元,  5 
     }
    }
}

fn1();

var tmp = arr2;
var max = tmp[0];

for(var i = 1;i < tmp.length;i++){
    if(max < tmp[i])
    {
        max = tmp[i];
    }  
}
alert(max);

var arr3 = [];
function fn1(){
    for(var i=0;i<arr.length;i++){
       if(typeof arr[i] == ‘number‘ && isNaN(Number(arr[i])))
        {
            arr3.push(i);
        }
    }
}
fn1();
alert(arr3);