具體代碼如下所述：
< !DOCTYPE html > <html lang = "en" > <head > <meta charset = "UTF-8" > <title > Document < /title></head > <style 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><div class="container"> <label>姓名不能為空</label > <input type = "text"id = "inp1" > <span > </span><br/ > <label > phone不能為空 < /label><input type="text" id="inp2"><span></span > <br / ></div><script> / / 失去焦點后判斷用戶輸入是否為空var inp1 = document.getElementById("inp1");inp1.onblur = function() { if (trim(this.value) === "") { alert("輸入不能為空"); } else { alert("輸入正確"); }};function trim(str) { return str.replace(/^/s+|/s+$/g, "");}var inp2 = document.getElementById("inp2");inp2.onblur = function(e) { if (inp2.value == "4444") { alert("正確");e.stopPropagation(); } else { alert("錯誤") }}; < /script></body > </html>總結
以上所述是小編給大家介紹的javascript實現文本框標簽驗證的實例代碼，希望對大家有所幫助，如果大家有任何疑問歡迎給我留言，小編會及時回復大家的！
新聞熱點
疑難解答
