onfocus= if(this.value=='Your password')this.value=''; > 新手

来源：学生作业帮编辑：神马作文网作业帮分类：综合作业时间：2024/11/12 23:14:24

onfocus= if(this.value=='Your password')this.value=''; > 新手学JSP 这句话看不懂 .
我想知道具体点的原理,我是新手不懂.

获得焦点后,清空文本框的默认值；

onfocus= if(this.value=='Your password')this.value=''; > 新手 this.value=1 onkeyup="this.value=this.value.replace(/\D/g,''), onblur="this.value=this.value.replace(/[\u4e00-\u9fa5]/g,'') onblur="this.value = formatNumber(this.value, 0, 0, true)" 这 a=(value>>n)|(value if(this.value=='ad'){button_a.style.display='block';}else{bu IF(VALUE(RIGHT(B7,1))=0,B6,IF(VALUE(LEFT(B7,1))/VALUE(RIGHT( this.niPH.Value = dataGridView1.SelectedRows[0].Cells["温度"]. Goodscode = this.dataGridView1.Rows[i].Cells[0].Value.ToStri int Value = 0x20;Value =Value&0x20;Printf("Value=%x\n",Value HiddenField1.Value = (Convert.ToInt32(HiddenField1.Value) +