JavaScript(js)深复制的几种方法

1.深复制deepClone

function deepCloneFn (obj){
  var copy;
  // Handle the 3 simple types, and null or undefined
  if (null == obj || "object" != typeof obj) return obj;

  // Handle Date
  if (obj instanceof Date) {
    copy = new Date();
    copy.setTime(obj.getTime());
    return copy;
  }

  // Handle Array
  if (obj instanceof Array) {
    copy = [];
    for (var i = 0, len = obj.length; i < len; i++) {
      copy[i] = deepCloneFn(obj[i]);
    }
    return copy;
  }

  // Handle Object
  if (obj instanceof Object) {
    copy = {};
    for (var attr in obj) {
      if (obj.hasOwnProperty(attr)) copy[attr] = deepCloneFn(obj[attr]);
    }
    return copy;
  }

  throw new Error("Unable to copy obj! Its type isn't supported.");
}

2.比较简洁深复制

  let newObj = JSON.parse(JSON.stringify(obj))