replace_2.js

// replace( 対象の文字, 置換する文字 );
var str = 'apple,banana,orange'
var replaced = str.replace(/,/g, ' ')
console.log(replaced)
// apple banana orange


var str = 'apple,banana,orange'
var replaced = str.replace(/,/g, '-')
console.log(replaced)
// apple-banana-orange


var str = 'apple,banana,orange'
var replaced = str.replace(/,/g, '_')
console.log(replaced)
// apple_banana_orange