JavaScript技巧1

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1:   //让IE支持getElementsByClassName document.getElementsByClassName = function(){  var tTagName ="*";  if(arguments.length > 1){   tTagName = arguments[1];  }  if(arguments.length > 2){   var pObj = arguments[2]  }else{   var pObj = document;  }  var objArr = pObj.getElementsByTagName(tTagName);  var tRObj = new Array();  for(var i=0; i<objArr.length; i++){   if(objArr[i].className == arguments[0]){    tRObj.push(objArr[i]);   }  }  return tRObj; }2:一般来说checkbox不能是只读的。为了实现只读功能，使用如下代码 <input type="checkbox" name="test2"/>   //设置checkbox为只读状态  var v_checkboxList = document.getElementsByName("test");  for(var i=0; i<v_checkboxList.length; i++) {   v_checkboxList[i].onclick = function(){return false;};  } 3:javascript设置一般元素为只读 function setReadonly(){    var v_input = document.getElementById("userName");    v_input.style.color = "red";    v_input.readOnly = true;    v_input.readOnly = false;   }