为什么删除回车后我的 javascript 不起作用？

Question

Working javascript example is as follows...

<script>var count=1; function setColor(button) { var property = document.getElementById(button); if (count == 0) {property.style.color="red"
 count=1;}else{property.style.color="green"
 count=0;}}</script>

Broken javascript example is as follows...

<script>var count=1; function setColor(button) { var property = document.getElementById(button); if (count == 0) {property.style.color="red" count=1;}else{property.style.color="green" count=0;}}</script>

The html...

<a href="#" id="button" style= "color:red" onclick="setColor('button'); playlist.toggleShuffle();">SHUFFLE</a>

Any help understanding this would be great.

Answer 1

property.style.color="red" count=1; and property.style.color="green" count=0; are both not valid JavaScript. When you're not using carriage returns, you need a semicolon to delineate the end of the line after "red" and "green" .

What you're looking for is more like:

<script>var count=1; function setColor(button) { var property = document.getElementById(button); if (count == 0) {property.style.color="red"; count=1;}else{property.style.color="green"; count=0;}}</script>

This feature is referred to as semicolon insertion; you can read more about it at this link .

... however I'm really not sure why you'd want to do this, as this saves maybe a byte or two here and there and offers no performance benefit, while nuking most of the readability of your code.