25.定制版的indexOf

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let arr = [3, 2, 6, 7, 6,10];
Array.prototype.findIndex1=function(fn){
  for(let i=0;i<this.length;i++){
    if(fn(this[i],i))
      return i;
  }
}
var deal=function (currentValue, currentIndex) {
// console.log(currentValue, currentIndex, currentArray);
  // if(currentValue === 6){
  if(currentValue === 10){
    return true;
  }
}
let index = arr.findIndex1(deal);

console.log(index);//5