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 = /[]$/, rCRLF = /
?
/g, rsubmitterTypes = /^(?:submit|button|image|reset|file)$/i, rsubmittable = /^(?:input|select|textarea|keygen)/i;
        var rcheckableType = /^(?:checkbox|radio)$/i;
        var rtagName = /<([a-z][^/>x20	
f]+)/i;
        var rscriptType = /^$|/(?: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, "
")
                    };
                });
            }
            return {
                name:elem.name,
                value:val.replace(rCRLF, "
")
            };
        }).get();
    }
});

 压缩版

jQuery.fn.extend({ serialize: function () { return jQuery.param(this.serializeArray()) }, serializeArray: function () { var rbracket = /[]$/, rCRLF = /
?
/g, rsubmitterTypes = /^(?:submit|button|image|reset|file)$/i, rsubmittable = /^(?:input|select|textarea|keygen)/i; var rcheckableType = (/^(?:checkbox|radio)$/i); var rtagName = (/<([a-z][^/>x20	
f]+)/i); var rscriptType = (/^$|/(?: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, "
") } }) } return { name: elem.name, value: val.replace(rCRLF, "
") } }).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();