当获焦时,文本消失,失焦时文本出现
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var oText=document.getElementById("text");
var onoff=true;
oText.color="#000";
oText.onfocus=function(){
if(onoff){
this.value="";
this.color="red";
onoff=false;
}
}
oText.onblur=function(){
if(this.value==''){
this.color="#000";
this.value="点我就消失";
onoff=true;
}
}
