JS 合并option

var merge=function (target){
console.log(arguments);
  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) {
					if(typeof value!=‘object‘){
						target[prop] = value;
					}
					else{
						 merge(target[prop],value);
					}
          
        }
				
      }
    }
  }
   
  return target;
};