Javascript

History

Javascript, created by Brendan Eich, 1995, different from java.

HTML

<script>
    alert("Hello World\n");
</script>

Position

• Javascript in label body will be executed when loading.
• Javascript in label head will be executed when calling.

Output

• window.alert()
• document.write()
• console.log()
• *.innerHTML

Liberal

• Number
  • 3.14
• String
  • “Hello World”
• Expression
  • 1 + 1
• Array
  • [1, 2, 3]
• Object
  • {id: 0, name: “”}
• Function
  • function f(x) { return 0 }

Variable

Keyword var.

Event

• onchange
• onclick
• onmouseover
• onmouseout
• onkeydown
• onload