javascript进阶一
一 window对象
http://www.w3school.com.cn/jsref/dom_obj_window.asp
二 setInterval的应用
模拟计时器
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script> function foo() { var current_time=(new Date()).toLocaleString() var ele_input=document.getElementById('d1') ele_input.value=current_time } var ID; function begining() { if(ID==undefined){ foo() ID=setInterval(foo,1000) } } function ending() { console.log('clear之前ID',ID) clearInterval(ID) console.log('clear之后ID',ID) ID=undefined } </script> </head> <body> <input type="text" id="d1"><button onclick="begining()">begin</button><button onclick="ending()">ending</button> </body> </html>
输出:
三 value固有属性的三个标签
input标签
textarea标签
select下的option标签
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <from> <input type="text" value="1"> <textarea name="" cols="30" rows="10" ></textarea> <select name="" id=""> <option value=""></option> </select> </from> </body> </html>