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1.$.proxy (Fn,context)

2.$ (window). scrolltop ()

3.requirejs:

Define a module

Define ([],function () {

Write a constructor + prototype

return {

XXX: Constructors

}

});

When used, var x = new X.xxx ({xxxx})

define ([' jquery '],function($) {  functionScrollTo1 (opts) { This. opts =$.extend ({}, Scrollto1.defaults, opts);  This. $el = $ (' html,body '); } ScrollTo1.prototype.move=function() {   if($ (window). scrolltop ()! = This. Opts.dest) {    if(! This. $el. Is (': Animated ')){        This. $el. Animate ({scrolltop: This. Opts.dest}, This. Opts.speed);  }   }  }; ScrollTo1.prototype.go=function() {     This. $el. ScrollTop ( This. Opts.dest)} Scrollto1.defaults={dest:0, Speed:800  }    return{scrollto:scrollto1}});

//This is the entry file .require.config ({paths:{jquery:' Jquery-2.1.4.min '}}); Require ([' jquery ', ' Scrollto '],function($,scroll) {varS =NewScroll. ScrollTo ({' dest ': 20}); $(' #backtop '). On (' click ', $.proxy (s.move,s)); //$ (window). On (' scroll ', function () {  //checkposition ($ (window). Height ());  // });  //checkposition ($ (window). Height ());  //function Checkposition (POS) {  //if ($ (window). scrolltop () > pos) {  //$ (' #backtop '). FadeIn ();  //}else{  //$ (' #backtop '). FadeOut ();  //   }  // }});

  $.fn.extend ({    backtop:function(opts) {     returnthis   . Each (function() {        new backtop (this, opts)      })          }  })

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