tuzhu_req.js realizes the effect of imitating Baidu picture homepage_jquery

tuzhu_req.js handles file request loading asynchronous synchronization function, imitating the effect of Baidu picture homepage

/*土著人开发的require组件 @土著人 (http://www.tuzhuren.com)*/
! function() {
  function e() {}
  Function.prototype.bind || (Function.prototype.bind = function(t) {
    var n = this;
    if ("function" != typeof n)
      throw new TypeError("Function.prototype.bind called on incompatible " + n);
    var o = r.call(arguments, 1),
      i = function() {
        if (this instanceof i) {
          var e = n.apply(this, o.concat(r.call(arguments)));
          return Object(e) === e ? e : this;
        }
        return n.apply(t, o.concat(r.call(arguments)));
      };
    return n.prototype && (e.prototype = n.prototype, i.prototype = new e, e.prototype = null), i;
  });
  var t = Array.prototype,
    r = t.slice;
}();
var require, define;
! function(e) {
  function t(e, t) {
    if (!(e in u)) {
      u[e] = !0;
      var r = document.createElement("script");
      if (t) {
        var o = setTimeout(t, require.timeout);
        r.onerror = function() {
          clearTimeout(o), t()
        }, r.onreadystatechange = function() {
          "complete" == this.readyState && clearTimeout(o)
        }
      }
      return r.type = "text/javascript", r.src = e, n.appendChild(r), r;
    }
  }
 
  function r(e, r, n) {
    var i = o[e] || (o[e] = []);
    i.push(r);
    var a, u = c[e] || {},
      s = u.pkg;
    a = s ? p[s].url : u.url || e, t(a, n && function() {
      n(e);
    });
  }
  function isFunction(it) {
    return Object.prototype.toString.call(it) === '[object Function]';
  }
  function isArray(it) {
    return Object.prototype.toString.call(it) === '[object Array]';
  }
  var n = document.getElementsByTagName("head")[0],
    o = {},
    i = {},
    a = {},
    u = {},
    c = {},
    p = {};
  define = function(name, deps, callback) {
    if (isArray(deps) && isFunction(callback)) {
      deps = callback;
    }
    i[name] = deps;
    var r = o[e];
    if (r) {
      for (var n = 0, a = r.length; a > n; ++n)
        r[n]();
      delete o[name];
    }
  }, require = function(e) {
    e = require.alias(e);
    var t = a[e];
    if (t)
      return t.exports;
    var r = i[e];
    if (!r)
      return false;
    t = a[e] = {
      exports: {}
    };
    var n = "function" == typeof r ? r.apply(t, [require, t.exports, t]) : r;
    return n && (t.exports = n), t.exports;
  }, require.async = function(t, n, o) {
    function a(e) {
      for (var t = e.length - 1; t >= 0; --t) {
        var n = e[t],
          p = c[n];
        p && "deps" in p && a(p.deps), n in i || n in s || (s[n] = !0, l++, r(n, u, o));
      }
    }
 
    function u() {
      if (0 == l--) {
        var r, o, i = [];
        for (r = 0, o = t.length; o > r; ++r)
          try {
            i[r] = require(t[r])
          } catch (a) {}
        n && n.apply(e, i);
      }
    }
    "string" == typeof t && (t = [t]);
    for (var p = t.length - 1; p >= 0; --p)
      t[p] = require.alias(t[p]);
    var s = {},
      l = 0;
    a(t), u();
  }, require.resourceMap = function(e) {
    var t, r;
    r = e.res;
    for (t in r)
      r.hasOwnProperty(t) && (c[t] = r[t]);
    r = e.pkg;
    for (t in r)
      r.hasOwnProperty(t) && (p[t] = r[t]);
  }, require.loadJs = function(e) {
    t(e);
  }, require.loadCss = function(e) {
    if (e.content) {
      var t = document.createElement("style");
      t.type = "text/css", t.styleSheet ? t.styleSheet.cssText = e.content : t.innerHTML = e.content, n.appendChild(t);
    } else if (e.url) {
      var r = document.createElement("link");
      r.href = e.url, r.rel = "stylesheet", r.type = "text/css", n.appendChild(r);
    }
  }, require.alias = function(e) {
    return e
  }, require.timeout = 5e3, define.amd = {
    jQuery: !0,
    version: "1.0.0"
  }
}(this);
! function() {
 (function() {
   var widgets = [],
     nameIdxMap = {},
     callbacks = [],
     remainings = 0;
   require.widget = {
     register: function(name) {
       var idx = nameIdxMap[name];
       if (idx == undefined) {
         nameIdxMap[name] = widgets.length;
         widgets.push(1);
         remainings++;
       } else {
         widgets[idx]++;
       }
     },
     ready: function(callback, ctx) {
       callbacks.push({
         func: callback,
         context: ctx
       });
       if (remainings < 1) {
         _ready();
       }
     },
     loaded: function(name) {
       var idx = nameIdxMap[name],
         num = widgets[idx] - 1;
 
       widgets[idx] = num;
       if (num == 0 && remainings) {
         remainings--;
       }
 
       if (remainings < 1) {
         _ready();
       }
     }
   };
 
   function _ready() {
     var callback;
     while (callback = callbacks.pop()) {
       callback.func.call(callback.ctx);
     }
   }
 })();
}();

I hope this article can help you learn to use javascript to handle file request loading asynchronous synchronization functions.