来自 编程 2019-12-27 17:03 的文章
当前位置: 澳门三合彩票 > 编程 > 正文

onclick中change函数加不加括号的区分,写在页面里

原生写的document.getElementById("adiv").onclick=function(){}不起作用,给函数起个名字比如cure,写在页面里调用cure即,onclick=“cure”才起作用,为啥前一种方式不起做用

(本试卷满分100分,考试时间为180分钟) (考生注意:答案须写在答题纸与机读答题卡上,写在本试题上一律不给分) PART I STRUCTURE AND VOCABULARY (20%)

<input onclick="change()" value="移动" type="button" id="btn">

var btn = document.getElementById('btn');
btn.onclick = change();
btn.onclick = change;
  1. Smith is to study medicine as soon as he ____ military service。

问题: onclick中change函数加不加括号的区别

A. will finish

代码的onclick事件是在html内写的,而代码2的onclick事件是在script中写的,这是最主要的区别。onclick事件如果在html内写的话,引号内代表要执行的代码,不加括号就不会调用要执行的那个函数。onclick事件在script写的话,如果加了括号就代表将这个函数的返回值直接赋给了onclick事件,也就是说页面直接会触发onclick的效果,不需要点击。这显然不是我们想要的效果,我们想要的效果是点击触发效果,是要将这个函数赋值给这个onclick属性,而不是返回值。所以在script内的onclick事件不应该加括号,而在html内的onlick事件是要加括号的。

B. has finished

C. finish

D. would finish

  1. He was laid _____ for six weeks with we broken ribs。

澳门三合彩票,A. in

B. out

C. up

D. down

  1. He _______ to be affected by many things。

A. forced

B. permitted

C. advised

D. tended

4."Did you remember to giver Anne the money you own her。

"Yes, ______ I saw her, I remembered."

A. momentarily

B. while

C. suddenly

D. the instant

  1. _______ the formation of the sun, the planets and other stars

began with the consideration of an interstellar cloud。

A. It accepted that

B. Accepted that

C. It is accepted that

D. That is accepted

  1. He is a man __ no one has a better right to speak。

A. whom

本文由澳门三合彩票发布于编程,转载请注明出处:onclick中change函数加不加括号的区分,写在页面里

关键词: