js驼峰与下划线转换

1、驼峰转下划线

function camelToUnderline(str) {

  return str.replace(/([A-Z])/g,"_$1").toLowerCase();

}

2、下划线转驼峰

function underlineToCamel(str) {

    return str.replace(/\_(\w)/g, (all,letter)=>letter.toUpperCase())

}