通过window.onload触发下面事件
window.onload = function(){
var mytr=document.getElementsByTagName("tr");
for (var i = 1;i < mytr.length; i++){
mytr[i].onmouseover = function(){
this.style.backgroundColor = "red";
}
mytr[i].onmouseout = function(){
this.style.backgroundColor = "white";
}
}
}