var username = document.getElementById('username').value; var password = document.getElementById('password').value; var password_2 = document.getElementById('password-2').value; var reg1 = /^\w{3,8}$/; var reg2 = /^\w{6,20}$/; if(reg1.test(username)){ alert("用户名必须是3-10位英文字母或数字!"); return false;; } else if (reg2.test(password)) { alert("口令必须是6-20位"); return false; } else if(password !== password_2){ alert("两次输入口令必须一致"); return false; } return true; } ~~~~ var reg1 = /^\w{3,8}$/; 正则必须要加开始结束限制符
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var username = document.getElementById('username').value; var password = document.getElementById('password').value; var password_2 = document.getElementById('password-2').value; var reg1 = /^\w{3,8}$/; var reg2 = /^\w{6,20}$/; if(reg1.test(username)){ alert("用户名必须是3-10位英文字母或数字!"); return false;; } else if (reg2.test(password)) { alert("口令必须是6-20位"); return false; } else if(password !== password_2){ alert("两次输入口令必须一致"); return false; } return true; } ~~~~ var reg1 = /^\w{3,8}$/; 正则必须要加开始结束限制符