js去重、常用拷贝

filter

let r= [],
    arr = ['apple', 'strawberry','pear'];
    r = arr.filter(function (element, index, self) {
      return self.indexOf(element) === index;
   });
  console.log(r.toString()); 

set 、array

Array.from(new Set(array));


let resultarr = [...new Set(arr)]; 

拷贝

1. 数组拷贝

	this.nodeNameList = [];
	
      for (let k in this.checkList1) {
        this.nodeNameList = [...this.nodeNameList, ...this.checkList1[k].nodeNames];
      }

2. 对象拷贝

this.entity={...this.entity}