function check_num_value(obj_name,obj,minvalue,maxvalue){ var reg = /^[0-9]+$/; if(obj.value!=""&&!reg.test(obj.value)){ alert(obj_name+'只能输入数字!'); obj.value = ""; obj.focus(); return false; }else if(minvalue>obj.value||obj.value>maxvalue){ ...
function CheckForm() { if(! isMail(form.Email.value)) { alert("您的电子邮件不合法!"); form.Email.focus(); return false; } if(! isEnglish(form.name.value)) { alert("英文名不合法!"); form.name.focus(); return false; } if(! isChinese(form.cnname.value)) { alert("中文名不合法!
/* * 校验是否为空(null/空串) */ var checkNull = function(str){ if(str == null || str == ""){ return false; } return true; } 1.2、校验是否为纯数字 /* * 校验是否为纯数字 * js的isNaN函数 */ var checkNum = function(num){ ...
AI代码解释 DHTML技术演示---表单验证functioncheckUserName(){//alert("aa");//测试这个失去焦点监听是否管用varoUserNameNode=document.getElementsByName("userName")[0];varname=oUserNameNode.value;//这个type="text"的value的值是方框内的字符//以后有后台时,“abcd”这个数据应该通过ajax技术向后台要//这里...
在本文中,我将介绍5种通过不必要的if-else语句来整理代码的方法。我将讨论默认参数,或(||)运算符,空位合并,可选链no-else-returns,和保护子句。 1、默认参数 你知道在使用不一致的API时会感到这种感觉,并且代码中断是因为某些值是undefined? letsumFun...
Do you want to determine if an element is actually hidden (e.g. visible) or if it is in fact a "hidden" input element? Both of these are slightly different however, you can use thejQuery .is() functionto check this : // Check if an element is visible on the screen (e.g. not...
If false, jQuery's text method will be used to insert content into the DOM. Use text if you're worried about XSS attacks. placement string | function 'top' How to position the tooltip - top | bottom | left | right | auto.When "auto" is specified, it will dynamically reorient the ...
Returns true if the number is even, false if the number is odd. Sample Solution: JavaScript Code: // Define a function 'isEven' that checks if a number 'num' is evenconstisEven=num=>num%2===0;// Test cases to check if numbers are evenconsole.log(isEven(3));// false (3 is not...
$(function(){ $('input[type=checkbox]').iCheck({ //注册复选框 checkboxClass: 'icheckbox_minimal-green', }); $('input[type=checkbox]').on('ifChecked', function(event){ em=$(this);//alert(event.type + ' callback'); if(em.val()=="1"){ em.iCheck('uncheck'); } }); }...
if (!Math.sign) { Math.sign = function(x) { return (x > 0) - (x < 0) || +x; }; } # Community Inputreturn (a < 0)? -1 : (a > 0)? 1 : 0;@letsmakesomebug : Math.sign() differentiates -0 and +0, this is outputting +0 for both, it is not the same. Anyway...