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