函数代码: 复制代码 代码如下: document.getElementByIdx_x=function(id){ if(typeof id =="string") return document.getElementById(id); else throw new error("please pass a string as a id!") }
实例代码: 复制代码 代码如下: <div id="box">9</div> <script> document.getElementByIdx_x=function(id){ if(typeof id =="string") return document.getElementById(id); else throw new error("please pass a string as a id!") } var timer = window.setInterval(function(){ document.getElementByIdx_x("box").innerHTML = parseInt(document.getElementByIdx_x("box").innerHTML) - 1; if(parseInt(document.getElementByIdx_x("box").innerHTML) < 0) { window.clearInterval(timer); window.location = "http://www.jb51.net"; } }, 1000); </script>