jquery trim() function source code_jquery

Copy code The code is as follows:

// 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, "" );
},

Analysis: The function of jquery trim() is to delete the spaces that appear on both sides of the string;

The key implementation is text.toString().replace( trimLeft, "" ).replace( trimRight, "" );

is to call replace twice on the incoming string. The regular expression trimLeft matches the space on the left and trimRight matches the space on the right.