JS 常用这些

JSON

var datas={'level':level,'provinceid':provinceid,'cityid':cityid,'areaid':areaid};

$.ajax({
type:"POST",
url: ROOT+id,
data: datas,
timeout:"4000",
dataType:"JSON",
success: function(data){

},
error:function(){
//alert("time out,try it");
}

}); 

onchage使用

<select onchange="location.href=this.value" onchange="window.open(this.options[this.selectedIndex].value)">
<option value="0">请选择</option>
<option value="{$r['siteurl']}">{$r['name']}</option>
</select>

<input name="username" id="username" class="login-text" onfocus="if(this.value==defaultValue) {this.value='';}" onblur="if(!value) {value=defaultValue; }" type="text" value="用户名">