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【①window.alert() :弹出警告框】
<script>window.alert(10*10);</script> window.alert(10+10) 会输出 20,而window.alert(
"10+10") 会输出 10+10。
【②document.write() :向文档输出内容】
<script>document.write(Date());</script> //输出当前时间
如果在文档已完成加载后执行 document.write,整个 HTML 页面将被覆盖。
【③innerHTML:通过id属性标识元素,然后重写其内容】
<script>document.getElementById("yun").innerHTML = "我觉得还可以。";</script>
【④console.log() :写入到浏览器的控制】
<script>y = 5;u = 6;h = y + u;console.log(h);</script> //点击F12,console
【小知识】
脚本可位于 HTML 的 body 或 head 标签中,或同时存在于俩部分。通常把函数放入head
部分或页面底部。也可将脚本保存在外部文件,扩展名为.js。