[javascript] replace 에서 | or \| 차이

var dataText = '12345|678910|asdfg';
var convertedText1 = dataText.replace(/|/g,"#");
var convertedText2 = dataText.replace(/\|/g,"#");

alert('convertedText1 : ' + convertedText1 + ' - convertedText2 : ' + convertedText2);

demo : https://jsfiddle.net/dv88jbkb/