About jquery smooth scrolling to the top plug-in

This article mainly introduces the smooth scrolling to the top plug-in based on jquery in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

The function of clicking a fixed button and smoothly scrolling to the top of the window is quite common in front-end development, as shown in the figure:

Key code :

$.fn.scrollTo = function(options) { 
  var defaults = { 
    toT: 0, //滚动目标位置 
    durTime: 500, //过渡动画时间 
    delay: 30, //定时器时间 
    callback: null //回调函数 
  }; 
  var opts = $.extend(defaults, options), 
    timer = null, 
    _this = this, 
    curTop = _this.scrollTop(), //滚动条当前的位置 
    subTop = opts.toT - curTop, //滚动条目标位置和当前位置的差值 
    index = 0, 
    dur = Math.round(opts.durTime / opts.delay), 
    smoothScroll = function(t) { 
      index++; 
      var per = Math.round(subTop / dur); 
      if (index >= dur) { 
        _this.scrollTop(t); 
        window.clearInterval(timer); 
        if (opts.callback && typeof opts.callback == 'function') { 
          opts.callback(); 
        } 
        return; 
      } else { 
        _this.scrollTop(curTop + index * per); 
      } 
    }; 
  timer = window.setInterval(function() { 
    smoothScroll(opts.toT); 
  }, opts.delay); 
  return _this; 
}; 
 
//调用 
 $("body").scrollTo({ toT: 0 });

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