html 提交表单，图片和文字一起提交，图片存入服务器，图片地址

if (!semantic && form.clk) {
// input type=='image' are not found in elements array! handle it here
var $input = $(form.clk),input = $input[0];
n = input.name;
if (n && !input.disabled && input.type == 'image') {
a.push({name: n,value: $input.val()});
a.push({name: n+'.x',value: form.clk_y});
}
}
return a;
};

/**

• Serializes form data into a 'submittable' string. This method will return a string
• in the format: name1=value1&name2=value2
  */
  $.fn.formSerialize = function(semantic) {
  //hand off to jQuery.param for proper encoding
  return $.param(this.formToArray(semantic));
  };

/**

• Serializes all field elements in the jQuery object into a query string.
• This method will return a string in the format: name1=value1&name2=value2
  */
  $.fn.fieldSerialize = function(successful) {
  var a = [];
  this.each(function() {
  var n = this.name;
  if (!n) {
  return;
  }
  var v = $.fieldValue(this,successful);
  if (v && v.constructor == Array) {
  for (var i=0,max=v.length; i < max; i++) {
  a.push({name: n,value: v[i]});
  }
  }
  else if (v !== null && typeof v != 'undefined') {
  a.push({name: this.name,value: v});
  }
  });
  //hand off to jQuery.param for proper encoding
  return $.param(a);
  };

/**

• Returns the value(s) of the element in the matched set. For example,consider the following form:
• <input name="B" type="checkbox" value="B2"/>
• var v = $('input[type=text]').fieldValue();
• // if no values are entered into the text inputs
• v == ['','']
• // if values entered into the text inputs are 'foo' and 'bar'
• v == ['foo','bar']
• var v = $('input[type=checkbox]').fieldValue();
• // if neither checkbox is checked
• v === undefined
• // if both checkboxes are checked
• v == ['B1','B2']
• var v = $('input[type=radio]').fieldValue();
• // if neither radio is checked
• v === undefined
• // if first radio is checked
• v == ['C1']
• The successful argument controls whether or not the field element must be 'successful'
• (per http://www.w3.org/TR/html4/interact/forms.html#successful-controls).
• The default value of the successful argument is true. If this value is false the value(s)
• for each element is returned.
• Note: This method always returns an array. If no valid value can be determined the
• array will be empty,otherwise it will contain one or more values.
  */
  $.fn.fieldValue = function(successful) {
  for (var val=[],i=0,max=this.length; i < max; i++) {
  var el = this[i];
  var v = $.fieldValue(el,successful);
  if (v === null || typeof v == 'undefined' || (v.constructor == Array && !v.length)) {
  continue;
  }
  if (v.constructor == Array) {
  $.merge(val,v);
  }
  else {
  val.push(v);
  }
  }
  return val;
  };

/**

• Returns the value of the field element.
  */
  $.fieldValue = function(el,successful) {
  var n = el.name,t = el.type,tag = el.tagName.toLowerCase();
  if (successful === undefined) {
  successful = true;
  }

  if (successful && (!n || el.disabled || t == 'reset' || t == 'button' ||
  (t == 'checkbox' || t == 'radio') && !el.checked ||
  (t == 'submit' || t == 'image') && el.form && el.form.clk != el ||
  tag == 'select' && el.selectedIndex == -1)) {
  return null;
  }

  if (tag == 'select') {
  var index = el.selectedIndex;
  if (index < 0) {
  return null;
  }
  var a = [],ops = el.options;
  var one = (t == 'select-one');
  var max = (one ? index+1 : ops.length);
  for(var i=(one ? index : 0); i < max; i++) {
  var op = ops[i];
  if (op.selected) {
  var v = op.value;
  if (!v) { // extra pain for IE...
  v = (op.attributes && op.attributes.value && !(op.attributes.value.specified)) ? op.text : op.value;
  }
  if (one) {
  return v;
  }
  a.push(v);
  }
  }
  return a;
  }
  return $(el).val();
  };

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