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One, the first case: called within the <script></script> tag.
1<script type= "Text/javascript" >2 functionAdd ()3 {4sum = 1 + 2;5 alert (sum);6 }7Add ();//call the function and write the function name directly. 8</script>9 Ten Another way of writing One<script type= "Text/javascript" > A functionAdd (A, b) { -sum = a +b; - alert (sum); the}//just write it once and you can -Add (1, 2);
Add (3, 4);//If more than one will follow the display
</script>
Two, the second situation: called in the HTML file, such as by clicking on the button to invoke the defined function.
<HTML><Head><Scripttype= "Text/javascript"> functionAdd () {sum=1+2; alert (sum); }</Script></Head><Body><form><inputtype= "button"value= "point Me"onclick= "Add ()">//button, onclick Click event, direct write function name</form></Body></HTML>
JavaScript function calls
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