jquery 前端表单验证

jQuery Validation Plugin 可谓是业界的标杆了，用它来做前端验证可谓杠杠的。下载地址：http://jqueryvalidation.org/

不过我们可以把里面的方法抽取出来，做更灵活的处理，学习观摩大师的作品。

验证email：

function( value) {
			// From http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html#e-mail-state-%28type=email%29
			// Retrieved 2014-01-14
			// If you have a problem with this implementation, report a bug against the above spec
			// Or use custom methods to implement your own email validation
			return /^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/.test( value );
		}

验证url：

function( value) {
			// contributed by Scott Gonzalez: http://projects.scottsplayground.com/iri/
			return /^(https?|s?ftp)://(((([a-z]|d|-|.|_|~|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(%[da-f]{2})|[!$&'()*+,;=]|:)*@)?(((d|[1-9]d|1dd|2[0-4]d|25[0-5]).(d|[1-9]d|1dd|2[0-4]d|25[0-5]).(d|[1-9]d|1dd|2[0-4]d|25[0-5]).(d|[1-9]d|1dd|2[0-4]d|25[0-5]))|((([a-z]|d|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(([a-z]|d|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])([a-z]|d|-|.|_|~|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])*([a-z]|d|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF]))).)+(([a-z]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(([a-z]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])([a-z]|d|-|.|_|~|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])*([a-z]|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF]))).?)(:d*)?)(/((([a-z]|d|-|.|_|~|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(%[da-f]{2})|[!$&'()*+,;=]|:|@)+(/(([a-z]|d|-|.|_|~|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(%[da-f]{2})|[!$&'()*+,;=]|:|@)*)*)?)?(?((([a-z]|d|-|.|_|~|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(%[da-f]{2})|[!$&'()*+,;=]|:|@)|[uE000-uF8FF]|/|?)*)?(#((([a-z]|d|-|.|_|~|[u00A0-uD7FFuF900-uFDCFuFDF0-uFFEF])|(%[da-f]{2})|[!$&'()*+,;=]|:|@)|/|?)*)?$/i.test( value );
		}

验证date：

function( value) {
			return  !/Invalid|NaN/.test( new Date( value ).toString() );
		}

验证dateISO：

function( value) {
			return /^d{4}[/-](0?[1-9]|1[012])[/-](0?[1-9]|[12][0-9]|3[01])$/.test( value );
		}

验证number：

function( value) {
			return  /^-?(?:d+|d{1,3}(?:,d{3})+)?(?:.d+)?$/.test( value );
		}

验证digits：

function( value) {
			return /^d+$/.test( value );
		}

验证creditcard：

function( value) {
			// accept only spaces, digits and dashes
			if ( /[^0-9 -]+/.test( value ) ) {
				return false;
			}
			var nCheck = 0,
				nDigit = 0,
				bEven = false,
				n, cDigit;

			value = value.replace( /D/g, "" );

			// Basing min and max length on
			// http://developer.ean.com/general_info/Valid_Credit_Card_Types
			if ( value.length < 13 || value.length > 19 ) {
				return false;
			}

			for ( n = value.length - 1; n >= 0; n--) {
				cDigit = value.charAt( n );
				nDigit = parseInt( cDigit, 10 );
				if ( bEven ) {
					if ( ( nDigit *= 2 ) > 9 ) {
						nDigit -= 9;
					}
				}
				nCheck += nDigit;
				bEven = !bEven;
			}

			return ( nCheck % 10 ) === 0;
		}

判断minlength：

function( value, param ) {
			var length = $.isArray( value ) ? value.length : this.getLength( value, element );
			return length >= param;
		}

判断maxlength：

 function( value, param ) {
			var length = $.isArray( value ) ? value.length : this.getLength( value, element );
			return length <= param;
		}

判断rangelength：

function( value, param ) {
			var length = $.isArray( value ) ? value.length : this.getLength( value, element );
			return ( length >= param[ 0 ] && length <= param[ 1 ] );
		}