JS Array IE does not support the IndexOf method solution

Under IE8, the JS array has no IndexOf method.

Here are the solutions I found:

before using the IndexOf method, execute the following JS, the principle is that if you find that the array has no IndexOf method, this method will be added.

if (! Array.prototype.indexOf)
{
  Array.prototype.indexOf = function (ELT/*, from*/)
  {
    var len = this.length >>> 0;

    var from = number (Arguments[1]) | | 0;
    from = (from < 0)
        ? Math.ceil (from)
        : Math.floor (from);
    if (from < 0)
      from + = Len;

for (; from < Len; from++)
{
if (from in this &&
This[from] = = = ELT)
return from;
}
return-1;
};
}

JS Array IE does not support the IndexOf method solution