setTimeout()使用

setTimeout(function() {
      // Do something after 5 seconds
}, 5000);

timeout = setTimeout('timeout_trigger()', 3000);
clearTimeout(timeout);

jQuery(document).ready(function () {
    //hide a div after 3 seconds
    setTimeout( "jQuery('#div').hide();",3000 );
});

jQuery(document).ready(function () {
    //hide a div after 3 seconds
    setTimeout(function(){ jQuery("#div").hide(); }, 3000);
});

<!-- show a message for 2 seconds after you click the button -->
<input type="button" value="click me" 
  onclick="setTimeout('window.alert(\'Hello!\')', 2000)" />

<script language="Javascript">

function timeout_trigger() {
    window.alert('Hello!');   
}

function timeout_init() {
    setTimeout('timeout_trigger()', 2000);
}

</script>
<input type="button" value="click me" onclick="timeout_init()" />

var timeover; 
    var timeout; 

    $(".namelistul li img").mouseover(function(){
               clearTimeout(timeover);
               clearTimeout(timeout);
               var namelistli = $(this).parent();//父节点
            timeover = setTimeout(function() {
                  if(namelistli.has("span").length==0){
                   var $span = $("<span class='namelistdel'  style='position:absolute;'><img src='/images/select_imgbt.png'></span>");
                   $(namelistli).prepend($span);
                   
                   }
            }, 150);
            //删除其他的span
               namelistli.siblings().find("span").remove(); 
            
               
    });

    $("body").on("mouseout", '.namelistdel', function(){
        clearTimeout(timeover); //鼠标离开解除延迟
        clearTimeout(timeout);
        timeout = setTimeout(function() {
                  $(".namelistdel").remove();
            }, 150);
      });