表单序列化用于传输数据

function serialize(form){    var part=[],        field=null,        i,        len,        option,        optLen,        optValue;    for(i=0,len=form.elements.length;i<len;i++){        field=form.elements[i];        console.log(field.type);        switch (field.type){            case "select-one":            case "select-multiple":                if(field.name.length){                    for(var j= 0,optLen=field.options.length;j<optLen;j++){                        option=field.options[j];                        if(option.selected){                            if(option.hasAttribute){                                optValue=(option.hasAttribute(‘value‘)?option.value:option.text);                            }else{                                optValue=(option.attribute(‘value‘).specified?option.value:option.text);                            }                            part.push(encodeURIComponent(field.name)+‘=‘+encodeURIComponent(optValue));                        }                    }                }            break;            case undefined:            case "file":            case "submit":            case "reset":            case "button":            break;            case "radio":            case "checkbox":                if(!field.checked){                    break;                }            default :                if(field.name.length){                    part.push(encodeURIComponent(field.name)+‘=‘+encodeURIComponent(field.value));                }        }    }    return part.join("&");}

reference ：高程14章