javascript提示返回类型总是object？

Question

function check_color(){
	
	color_input = prompt("I am thinking of one of these colors: \n\n"+
						  "blue, cyan, gold, gray, magenta, orange, red, white, yellow \n\n"+
						  "What color am I thinking of?");
	
	if(color_input != null || color_input != undefined){
	
		if(typeof (color_input) != 'string') {
			alert("This is not any color. \n\n"+
			  "Please enter color in text format");
			return false;
	}
	
		if(colors.indexOf(color_input) < 0){
			alert("Sorry, i don't recognize your color. \n\n"+
			  "Please try again");
			return false;
	}
  }
  else{
	  alert("Please enter some input");
	  return false;
  }
}

为什么在尝试运行此代码时总是执行第一个 if block ？有人可以解释一下吗？

Answer 1

“颜色”在哪里 if(colors.indexOf(color_input)

我在这里收到控制台错误。 请添加颜色数组