var arr = . getElementsByTagName("");
for(var x=0; x<arr.length; x++) {
arr[].innerHTML="PHP中文网";
}
<script>
var d = document.(""); d..= "red";
</script>
<button ="msg()">点我</button>
<script>
msg() {
alert("Hi!");
}
</script>
<div ="alert('欢迎来PHP中文网学习编程!');"> 将鼠标移动到这边看看! </div>