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                ## onfocus //聚焦 ## ## onblur //失焦事件 概述:我們可以給任意綁定聚焦,失焦點事件【一般和表單元素一起使用】 ### 聚焦與失焦理解(輸入賬號密碼的框里,點擊有光標閃爍的時候就是聚焦,移出文本框,光標不閃爍就是失焦) ## 語法 注意:變量名稱為獲取節點樣式的變量名稱 ``` 變量名稱.onfocus=function(){ } ``` ``` 變量名稱.onblur=function(){ } ``` 驗證是否為手機號代碼 ``` </head> <body> <p>請輸入你的手機號:<input type="text" id="box"><span class="txt" id="plone"></span></p> </body> </html> <script style="text/javascript"> var input =document.getElementById("box"); //獲取輸入框 var span =document.getElementById("plone"); //獲取文本span元素 input.onfocus=function(){ input.style.color="red"; } input.onblur=function(){ input.style.color="rgb(0,0,0)"; var txt=input.value; //獲取文本框文本 var jc=/^1[3456789]\d{9}/; //正則表達式 if(jc.test(txt)==true){ span.innerHTML="你輸入的是手機號碼"; span.style.color="green"; }else{ span.innerHTML="請輸入有效的11位中國大陸手機號碼"; span.style.color="red"; } } </script> ```
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