表单序列化

function serialize(form){
            var parts = [],
            field = null,
            i,
            len,
            j,
            optLen,
            option,
            optValue;
            for (i=0,len=form.elements.length;i<len ;i++ )
            {
                field = form.elements[i];
                switch (field.type)
                {
                    case ‘select-one‘:
                    case ‘select-multiple‘:
                        if (field.name.length)
                        {
                            for (j=0,optLen=field.options.length;j<optLen ;j++ )
                            {
                                option = field.options[j];
                                if (option.selected)
                                {
                                    optValue = ‘‘;
                                    if (option.hasAttribute)
                                    {
                                        optValue = (option.hasAttribute(‘value‘) ? option.value :option.text);
                                    }else {
                                        optValue = (option.sttributes[‘value‘].specified ? option.value : option.text);
                                    }
                                    parts.push( encodeURIComponet(field.anme) + ‘=‘ + ebcodeURIComponet(optValue) );
                                }
                            }
                        }
                        break;
                    case undefined: //字段集
                    case ‘file‘://文件输入
                    case ‘submit‘://提交按钮
                    case ‘reset‘ ://重置按钮
                    case ‘button‘://自定义按钮
                        break;
                    case ‘radio‘://单选按钮
                    case ‘checkbox‘://复选框
                        if (!field.checked){
                            break;
                        }
                    default:
                        if (field.name.length)
                        {
                            parts.push( encodeURIComponent(field.name) + ‘=‘ + encodeURIComponent(field.value) );
                        } 
                }
            }
            return parts.join(‘&‘);
        }