jquery trim () Functional Source code _jquery

Copy Code code 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 jquery trim () function is to delete the space appearing on both sides of the string;

One of the key implementations is text.tostring (). Replace (Trimleft, ""). Replace (TrimRight, "");

is to call replace the passed-in string two times, where the regular expression trimleft is matching the left space, TrimRight is the right space