<?php
$str1="Hello";
$str2="start PHP";
echo "<script>";
echo "alert("".$str1."");";
echo "</script>";
?>
<input type="text" name="tx" size="20" value="<?php echo $str1;?>">
<input type="button" value="click" onclick="tx.value="<?php echo $str2;?>"">
ok
Why does not start PHP? appear when clicking click,
tx is not defined
change onclik to:
onclick="var tx = document.getElementsByTagName('input')[0];tx.value='<?php echo $str2;?>'" 
Brother, your tx is not defined, and the browser doesn't know who tx is. If you want it to do something, you have to tell it who tx is. Change it, for example:
<input type="button" value="click" onclick="document.getElementsByName('tx')[0].value=''">Previous: How to catch and handle global exceptions and errors in vuejs2.0 and submit them to the background
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