jquery trim() 功能源代码

// Used for trimming whitespace
trimLeft = /^/s+/,
trimRight = //s+$/,

// Use native String.trim function wherever possible
trim: trim ?
function( text ) {
return text == null ?
"" :
trim.call( text );
} :

// Otherwise use our own trimming functionality
function( text ) {
return text == null ?
"" :
text.toString().replace( trimLeft, "" ).replace( trimRight, "" );
},