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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 ); } }
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原文地址：http://www.cnblogs.com/guangshan/p/4682109.html
