重写jQuery serialize方法，使文本框在没有输入的情况下，使用其支持默认值

未压缩版

 jQuery.fn.extend({
     serialize:function() {
         return jQuery.param(this.serializeArray());
     },
     serializeArray:function() {
         var rbracket = /\[\]$/, rCRLF = /\r?\n/g, rsubmitterTypes = /^(?:submit|button|image|reset|file)$/i, rsubmittable = /^(?:input|select|textarea|keygen)/i;
         var rcheckableType = /^(?:checkbox|radio)$/i;
         var rtagName = /<([a-z][^\/\0>\x20\t\r\n\f]+)/i;
         var rscriptType = /^$|\/(?:java|ecma)script/i;
         return this.map(function() {
             var elements = jQuery.prop(this, "elements");
             return elements ? jQuery.makeArray(elements) :this;
         }).filter(function() {
             var type = this.type;
             return this.name && !jQuery(this).is(":disabled") && rsubmittable.test(this.nodeName) && !rsubmitterTypes.test(type) && (this.checked || !rcheckableType.test(type));
         }).map(function(i, elem) {
             var val = jQuery(this).val();
             if (val == null) {
                 return null;
             }
             if (val == "") {
                 if (jQuery(this).is("[default]")) {
                     val = jQuery(this).attr("default");
                 }
             }
             if (Array.isArray(val)) {
                 return jQuery.map(val, function(val) {
                     return {
                         name:elem.name,
                         value:val.replace(rCRLF, "\r\n")
                     };
                 });
             }
             return {
                 name:elem.name,
                 value:val.replace(rCRLF, "\r\n")
             };
         }).get();
     }
 });

压缩版

jQuery.fn.extend({ serialize: function () { return jQuery.param(this.serializeArray()) }, serializeArray: function () { var rbracket = /\[\]$/, rCRLF = /\r?\n/g, rsubmitterTypes = /^(?:submit|button|image|reset|file)$/i, rsubmittable = /^(?:input|select|textarea|keygen)/i; var rcheckableType = (/^(?:checkbox|radio)$/i); var rtagName = (/<([a-z][^\/\0>\x20\t\r\n\f]+)/i); var rscriptType = (/^$|\/(?:java|ecma)script/i); return this.map(function () { var elements = jQuery.prop(this, "elements"); return elements ? jQuery.makeArray(elements) : this }).filter(function () { var type = this.type; return this.name && !jQuery(this).is(":disabled") && rsubmittable.test(this.nodeName) && !rsubmitterTypes.test(type) && (this.checked || !rcheckableType.test(type)) }).map(function (i, elem) { var val = jQuery(this).val(); if (val == null) { return null } if (val == "") { if (jQuery(this).is("[default]")) { val = jQuery(this).attr("default") } } if (Array.isArray(val)) { return jQuery.map(val, function (val) { return { name: elem.name, value: val.replace(rCRLF, "\r\n") } }) } return { name: elem.name, value: val.replace(rCRLF, "\r\n") } }).get() } });

　　文本框的添加属性 default

<form id="from">
<input type="input" name="name" default="test"/>
</form>

使用方法

$("#form").serialize();