JavaScript(js)中合并对象的方法merge/extend

方法封装

function merge(target) {
  for (let i = 1, j = arguments.length; i < j; i++) {
    let source = arguments[i] || {};
    for (let prop in source) {
      if (source.hasOwnProperty(prop)) {
        let value = source[prop];
        if (value !== undefined) {
          target[prop] = value;
        }
      }
    }
  }

  return target;
};

merge({1: 12}, {a: 1234}, {b: 333, a: "覆盖前面的"})
/**
{
1: 12,
a: "覆盖前面的",
b: 333
}*/