Jquery ajax的参数格式化

　　jQuery的ajax会自动将js对象转换为可传递的参数，$.param(jsobj, boolean)，但是默认会把对象中数组类型加上[]符号，后台就不怎么好取了

　　参数boolean为true时不加[]，默认为false。

下面是jQuery参数格式化的源代码

假设对象为{a:1,b:[2,3]}

$.ajax中：

// Convert data if not already a string
        if ( s.data && s.processData && typeof s.data !== "string" ) {
            s.data = jQuery.param( s.data, s.traditional );
        }

使用的$.param格式化（traditional就是第二个参数）

jQuery.param = function( a, traditional ) {
    var prefix,
        s = [],
        add = function( key, value ) {
            // If value is a function, invoke it and return its value
            value = jQuery.isFunction( value ) ? value() : ( value == null ? "" : value );
            s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
        };

    // Set traditional to true for jQuery <= 1.3.2 behavior.
    if ( traditional === undefined ) {
        traditional = jQuery.ajaxSettings && jQuery.ajaxSettings.traditional;
    }

    // If an array was passed in, assume that it is an array of form elements.
    if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {
        // Serialize the form elements
        jQuery.each( a, function() {
            add( this.name, this.value );
        });

    } else {
        // If traditional, encode the "old" way (the way 1.3.2 or older
        // did it), otherwise encode params recursively.
        for ( prefix in a ) {
            buildParams( prefix, a[ prefix ], traditional, add );
        }
    }

    // Return the resulting serialization
    return s.join( "&" ).replace( r20, "+" );
};

调用buildParams( prefix, a[ prefix ], traditional, add )

function buildParams( prefix, obj, traditional, add ) {
    var name;

    if ( jQuery.isArray( obj ) ) {
        // Serialize array item.
        jQuery.each( obj, function( i, v ) {
            if ( traditional || rbracket.test( prefix ) ) {
                // Treat each array item as a scalar.
                add( prefix, v );

            } else {
                // Item is non-scalar (array or object), encode its numeric index.
                buildParams( prefix + "[" + ( typeof v === "object" ? i : "" ) + "]", v, traditional, add );
            }
        });

    } else if ( !traditional && jQuery.type( obj ) === "object" ) {
        // Serialize object item.
        for ( name in obj ) {
            buildParams( prefix + "[" + name + "]", obj[ name ], traditional, add );
        }

    } else {
        // Serialize scalar item.
        add( prefix, obj );
    }
}