JQuery Uncaught TypeError

Question

In Chrome debugger I get an Uncaught TypeError: undefined is not a function when it parses this bit of code:

var pay = '{{payt}}';

if (pay.contains('visa')){
 $('#visa').prop('checked', true);
}

However this causes no problems in Firefox and executes the code. What woould cause this error?

EDIT: indexOf() works -

if (pay.indexOf("visa")!=-1){
 $('#visa').prop('checked', true);
}

Answer 1

根据MDN文档 ，Chrome尚不支持.contains函数。

Answer 2

As the "undefined" user said, a polyfill is your best bet for ECMAScript functions that do not yet exist in the standard browsers.

if ( !String.prototype.contains ) {
  String.prototype.contains = function() {
    return String.prototype.indexOf.apply( this, arguments ) !== -1;
  };
}

Source: MDN for String.prototype.contains()