js封装设置默认参数

function zjy_Carousel(settings){

  var defaultSettings = {

    target: '.slider',

    btn_ul: ".bannar_button",

    btn_w: 28,

    animate_time: 1000,

    targetobj:'.slider li' ,

    btn_span: ".bannar_button span",

    w: 640,

    h: 320,

  }

  settings =$.extend(defaultSettings,settings);

  console.log(settings .w);

}

zjy_Carousel({w:50});

//输出50