JavaScript method to determine whether a string contains a specified substring_javascript skills

The example in this article describes how JavaScript determines whether a string contains a specified substring. Share it with everyone for your reference. The specific analysis is as follows:

The following JS code defines a contains method for the String object to determine whether the string contains substrings, which is very useful.

if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function(obj, start) {
     for (var i = (start || 0), j = this.length; i < j; i++) {
       if (this[i] === obj) { return i; }
     }
     return -1;
  }
}
if (!String.prototype.contains) {
  String.prototype.contains = function (arg) {
    return !!~this.indexOf(arg);
  };
}

The following is a detailed usage example, which can be executed in the browser

Copy code The code is as follows:

Enter two strings and check if Strign 1 contains String 2.0c6dc11e160d3b678d68754cc175188a 2a87851f231f0546ed00aa1a4409038e
String 1: 8b2dfcb1ad9bf3ba83dfe88c90df09d4  0c6dc11e160d3b678d68754cc175188a
String 2: 44d73486c1f5551b0081888bd7d6fb4b 0c6dc11e160d3b678d68754cc175188a0c6dc11e160d3b678d68754cc175188a
ad300d42e070861449b92412a058adf9Click to check if String 1 contains String 265281c5ac262bf6d81768915a4a77ac0
3f1c4e4b6b16bbbd69b2ee476dc4f83a
if (!Array.prototype.indexOf) {
Array.prototype.indexOf = function(obj, start) {
for (var i = (start || 0), j = this.length; i 260284935f702d38c2d353c4811ea552

I hope this article will be helpful to everyone’s JavaScript programming design.