<input type="text" name="name" id="name" οnmοuseοver="clean()" value="清空"/>
<script>
function clean(){
var name = this.value();
if(name=='清空'){
this.value='';
this.select();
}
}
</script>
<input type="text" name="name" id="name" οnmοuseοver="clean()" value="清空"/>
<script>
function clean(){
var name = this.value();
if(name=='清空'){
this.value='';
this.select();
}
}
</script>
shell腳本獲取腳本所在目錄 執行腳本的父目錄不一定是當前的工作目錄。 url=$(dirname $(readlink -f $0))