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PHP echo了一个旋钮，但是触发不了click事件

WBOY
Release： 2016-06-13 12:45:52
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PHP echo了一个按钮，但是触发不了click事件

<br />
<?php <br />
echo '<input name="minus"  type="button" value="-" onclick="num_minus("xx");"/>';<br />
echo '<input name="num" id="xx" type="text" width="16" value="1"'.'>';<br />
echo '<input name="plus" type="button" value="+" onclick="num_plus("xx");"/>';<br />
?><br />
<script type="text/javascript"><br />
function num_plus(id_num)<br />
{<br />
	document.getElementById(id_num).value++;<br />
	//document.getElementById('num').value=parseInt(document.getElementById('num').value)+1;<br />
        //parseInt(a,b)将a解析成b进制数<br />
}<br />
function num_minus(id_num)<br />
{<br />
	if(document.getElementById(id_num).value==1)<br />
		document.getElementById(id_num).value=1;<br />
	else<br />
	    document.getElementById(id_num).value--;<br />
}<br />
</script><br />
<br />
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PHP 按钮 click

Related labels：
document getelementbyid nbsp
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