为什么这个javascript onclick加载代码运行没有我明确告诉它？

我有一些javascript改变#hash URL并使用AJAX将一些HTML加载到一个元素中.

// Manually trigger a hashchange to start the app.
$(window).trigger('hashchange');


function makeContentView() {
  document.location.hash = "content";
  return false; // we don't want event propagation - just AJAX call
}


$(function () {

  $(window).on('hashchange', function () {
    // On every hash change the render function is called with the new hash.
    // This is how the navigation of our app happens.
    render(window.location.hash);
  });

  function render(url) {
    // This function decides what type of page to show 
    // depending on the current url hash value.

    switch (url) {
      case "#home":
        $("#AJAX_Parent").load("body/index_body.html #AJAX_Child");
        break;
      case "#grid":
        $("#AJAX_Parent").load("body/grid_body.html #AJAX_Child", function () {

            var contents = document.getElementsByClassName("thumbnailImage");

              for (i = 0; i < contents.length; i++) {

                // THIS FUNCTION GETS CALLED WITHOUT ME CLICKING
                contents.item(i).onclick = makeContentView();
              }

          }); // makeContentView IS ALWAYS BEING CALLED IMMEDIATELY
    ... // More switch options

^请注意,在上面的例子中,"contents.item(i).onclick = makeContentView();" 将makeContentView函数分配给我的页面缩略图图像的onclick处理程序,但无条件触发此makeContentView函数.

我只想在使用class = thumbnailImage单击6个缩略图图像中的一个时调用makeContentView

makeContentView();

这是一个函数调用.不要使用()来分配函数引用.