Finally solved the problem that IE8 does not support the indexOf method of array_javascript skills

Here’s the solution I found:

Before using the indexOf method, execute the following js. The principle is that if it is found that the array does not have an indexOf method, this method will be added.

Copy code The code is as follows:

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;
};
}