lovecoding
/
class


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <a href="https://www.baidu.com">哈哈哈哈</a>
    <script>
        var a = document.querySelector("a");
        a.onclick = function () {
            alert("哈哈哈哈");
            event.returnValue = false;
            // event.preventDefault()
        }
        // 取消元素默认事件
        // event.returnValue = false;
        // event.preventDefault()
    </script>
</body>
</html>