具体代码如下所述：
< !DOCTYPE html >document < /title> </head > <sty1e type = "text/css" > body { background: #ccc; } label { width: 100px; display: inline - block; } span { color: red; }.container { margin: 100px auto; width: 400px; padding: 50px; line - height: 40px; } span { margin - left: 30px; font - size: 12px; } < /style> <body> <label>姓名不能为空</label > <input type = "text"id = "inp1" > <br/ > <label > phone不能为空 < /label><input type="text" id="inp2"></span > <br / > <script> / / 失去焦点后判断用户输入是否为空 var inp1 = document.getElementById("inp1"); inp1.onblur = function() { if (trim(this.value) === "") { alert("输入不能为空"); } else { alert("输入正确"); } }; function trim(str) { return str.replace(/^s+|s+$/g, ""); } var inp2 = document.getElementById("inp2"); inp2.onblur = function(e) { if (inp2.value == "4444") { alert("正确"); e.stopPropagation(); } else { alert("错误") } }; < /script> </body > </html> </pre> <p><strong>总结</strong></p> 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