apply 数组

[yongheng2016]

apply 天生可以传数组为参数
可以对存在数组的参数进行操作

对arr1操作，输出：[1,4,5,6,2,3]

  var arr1 = [1,2,3]
  var arr2 = [4,5,6]
  var arr = [1,0].concat(arr2)
  Array.prototype.splice.apply(arr1, arr)
 console.log(arr1)

• es6

  var arr1 = [1,2,3]
  var arr2 = [4,5,6]
arr1.splice(1,0,...arr2)  //es6

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apply经典应用

Math.max

var arr = [1,2,3]
Math.max.apply(null, arr)