javascript - 即使 If block 为 true，JavaScript 程序的 Else block 也始终执行

Question

即使为 true，Else block 也会继续执行。如果我删除 else block ，那么程序就可以正常工作。我想做的就是检查用户是否不在记录中，然后打印未找到。

var students = 
[
	{
		name: "Linda",
		track: "IOS",
		points:' 50'
	},
	{
		name: "Brian",
		track: "Android",
		points: '80'
	},
	{
	    name: 'Trish',
	    track: 'Rails Development',
	    points: '350'
	}
];

 		var search = " ";
  		var student;
  		var message = " ";

	function print ( msg )
	{
		var output = document.getElementById("output");
		output.innerHTML = msg;
	}

	function studentReport( student )
	{
		var report 	= "<h2> Student name: " + " " + student.name + "</h2>";
			report += "<p>  Student track: " + " " + student.track+ "</p>";
			report += "<p>  Student points: "+ " " + student.points+ "</p>";
			return report;
	} 

	var button = document.getElementById("search");

		/*search = prompt("Enter a name to search database or type quit to exit");*/
		button.onclick = function( )
	{
		
		search = document.getElementById("txtField").value;
		for( var i = 0; i < students.length; i++ )
		{
			student = students[i];

			if( student.name.toLowerCase() === search.toLowerCase() )
			{
				message = studentReport(student);
				print(message);
			}
			
			else
			{
				message = "<h2> Student not found </h2>";
				print( message);
			}

		}

		
		
	}
		

<div class="container">
		<form action="#">
			<input type="text" name="search" id="txtField"><!--
			--><a href="#" id="search"> Search </a>
		</form>
		

	<div id="output">

	</div>

	</div>

通过删除其他部分程序搜索姓名并显示学生记录。其他部分应该检查学生是否不存在于数组中，然后打印未找到。

Answer 1

将 break; 添加到 if 语句中，以便循环停止计算。否则，只有最后的结果才会更新 HTML。