Javascript code _ javascript skills for checking data

Some JS code related to checking data. These JS code are some code that is often used during form submission. most of the code is also written using regular expressions!


// Remove the left space;
Function ltrim (s ){
Return s. replace (/^ \ s */,"");
}
// Remove the right space;
Function rtrim (s ){
Return s. replace (/\ s * $ /,"");
}
// Remove left and right spaces;
Function trim (s ){
Return rtrim (ltrim (s ));
}
// Whether it is null;
Function IsEmpty (_ str ){
Var tmp_str = trim (_ str );
Return tmp_str.length = 0;
}
// Valid Email;
Function IsMail (_ str ){
Var tmp_str = trim (_ str );
Var pattern =/^ [_ a-z0-9-] + (. [_ a-z0-9-] +) * @ [a-z0-9-] + (. [a-z0-9-] +) * $ /;
Return pattern. test (tmp_str );
}
// Valid number;
Function IsNumber (_ str ){
Var tmp_str = trim (_ str );
Var pattern =/^ [0-9]/;
Return pattern. test (tmp_str );
}
// Valid color value;
Function IsColor (color ){
Var temp = color;
If (temp = "") return true;
If (temp. length! = 7) return false;
Return (temp. search (// # [a-fA-F0-9] {6 }/)! =-1 );
}
// Valid link;
Function IsURL (url ){
Var sTemp;
Var B = true;
STemp = url. substring (0, 7 );
STemp = sTemp. toUpperCase ();
If (sTemp! = "HTTP: //") | (url. length <10 )){
B = false;
}
Return B;
}
// Indicates whether the mobile phone number is valid;
Function IsMobile (_ str ){
Var tmp_str = trim (_ str );
Var pattern =/13 \ d {9 }/;
Return pattern. test (tmp_str );
}