JS foreach function

Citation: http://www.jb51.net/article/67441.htm

English reference: http://www.tutorialspoint.com/javascript/array_foreach.htm

The ForEach () method of the JavaScript array calls each element in the array.
Grammar

Array.foreach (callback[, Thisobject]);

The following is the details of the parameters:

• Callback: A function that tests each element in the array. Function to test for each element of an array.
• Thisobject: Executes the callback function as the object referred to in this. Object to use as this when executing callback.

return value:

Returns the created array.
Compatibility:

This approach is a JavaScript extension to the ECMA-262 standard, so it may not exist in other implementations of the standard. To make it work, you need to add the following script code to the top:

if(!Array.prototype.forEach) {Array.prototype.forEach=function(Fun/*, Thisp*/) {  varLen = This. Length; if(typeofFun! = "function")   Throw NewTypeError (); varThisp = arguments[1];  for(vari = 0; i < Len; i++)  {   if(Iinch  This) Fun.call (Thisp, This[i], I, This); } };}

Example:

if(!Array.prototype.forEach) {Array.prototype.forEach=function(Fun/*, Thisp*/) {  varLen = This. Length; if(typeofFun! = "function")   Throw NewTypeError (); varThisp = arguments[1];  for(vari = 0; i < Len; i++)  {   if(Iinch  This) Fun.call (Thisp, This[i], I, This); } };}functionPRINTBR (element, index, array) {document.write ("<br/>[" + index + "is" +element); }[12, 5, 8, 130, 44].foreach (PRINTBR); </script></body>
This will produce the following results:
[0] is a[1] is 5[2] was 8[3] is[
JS foreach function