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// Chain conversions given the request and the original response
function ajaxConvert( s, response ) {
var conv, conv2, current, tmp,
// Work with a copy of dataTypes in case we need to modify it for conversion
dataTypes = s.dataTypes.slice(),
prev = dataTypes[ 0 ],
converters = {},
i = 0;
// Apply the dataFilter if provided
if ( s.dataFilter ) {
response = s.dataFilter( response, s.dataType );
}
// Create converters map with lowercased keys
if ( dataTypes[ 1 ] ) {
for ( conv in s.converters ) {
converters[ conv.toLowerCase() ] = s.converters[ conv ];
}
}
// Convert to each sequential dataType, tolerating list modification
for ( ; (current = dataTypes[++i]); ) {
// There's only work to do if current dataType is non-auto
if ( current !== "*" ) {
// Convert response if prev dataType is non-auto and differs from current
if ( prev !== "*" && prev !== current ) {
// Seek a direct converter
conv = converters[ prev + " " + current ] || converters[ "* " + current ];
// If none found, seek a pair
if ( !conv ) {
for ( conv2 in converters ) {
// If conv2 outputs current
tmp = conv2.split(" ");
if ( tmp[ 1 ] === current ) {
// If prev can be converted to accepted input
conv = converters[ prev + " " + tmp[ 0 ] ] ||
converters[ "* " + tmp[ 0 ] ];
if ( conv ) {
// Condense equivalence converters
if ( conv === true ) {
conv = converters[ conv2 ];
// Otherwise, insert the intermediate dataType
} else if ( converters[ conv2 ] !== true ) {
current = tmp[ 0 ];
dataTypes.splice( i--, 0, current );
}
break;
}
}
}
}
// Apply converter (if not an equivalence)
if ( conv !== true ) {
// Unless errors are allowed to bubble, catch and return them
if ( conv && s["throws"] ) {
response = conv( response );
} else {
try {
response = conv( response );
} catch ( e ) {
return { state: "parsererror", error: conv ? e : "No conversion from " + prev + " to " + current };
}
}
}
}
// Update prev for next iteration
prev = current;
}
}
return { state: "success", data: response };
}
s.dataTypes.slice()
是不是相当于
s.dataTypes.slice(0)