为什么我写的js代码没有起作用
本帖最后由 cherry_chenxiao 于 2014-05-09 18:00:50 编辑
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<script><br /> String.prototype.trim = function() {return this.replace(/^\s+|\s+$/g, '');}<br /> function do_submit() {<br /> var username = document.getElementById('username');<br /> if ( username.value.trim() == '' ) {<br /> window.alert('用户名尚未填写。');<br /> username.className = 'input-error'; //设置CSS样式<br /> username.focus(); //聚焦<br /> username.value = '';<br /> return false; //阻止表单提交<br /> }<br /> <br /> var pwd = document.getElementById('pwd');<br /> if ( pwd.value.trim() == '' ) {<br /> window.alert('密码尚未填写。');<br /> pwd.className = 'input-error';<br /> pwd.focus();<br /> pwd.value = '';<br /> return false;<br /> }<br /> //window.alert(passwd.value.trim().length);<br /> if ( pwd.value.trim().length < 6 ) {<br /> window.alert('密码不能少于六位!');<br /> pwd.className = 'input-error';<br /> pwd.focus();<br /> pwd.value = '';<br /> return false;<br /> }<br /> <br /> var repwd = document.getElementById('repwd');<br /> if ( repwd.value.trim() == '' ) {<br /> window.alert('重复密码尚未填写。');<br /> repwd.className = 'input-error';<br /> repwd.focus();<br /> repwd.value = '';<br /> return false;<br /> } else {<br /> if ( pwd.value.trim() != repwd.value.trim() ) {<br /> window.alert('两次密码不一致!');<br /> return false;<br /> }<br /> }<br /> <br /> var email = document.getElementById('email');<br /> if ( email.value.trim() == '' ) {<br /> window.alert('电子邮件尚未填写。');<br /> email.className = 'input-error';<br /> email.focus();<br /> email.value = '';<br /> return false; <br /> }<br /></script>
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