這個題get的三點:1、刪除節(jié)點后它并不會斷鏈,會自動排列起來。2、順序是倒敘是因為自動排列,所以刪了第一個以后,第二個會變成第一個,而下標(biāo)已經(jīng)加一了。3、順序刪除可能會刪除空節(jié)點。其實好像不影響?
2019-03-14
var b = 100%7;//這個是取余運算,100%7就是100/7的余數(shù) 100/7=14在余2,所以100%7=2
2019-03-13
var liObj = document.getElementsByTagName("li");
for(let i=0;i<liObj.length;i++){
document.write(`第${i+1}個li的nodeName是${liObj[i].nodeName},nodeValue是${liObj[i].nodeValue},nodeType是${liObj[i].nodeType};<br>`)
}
for(let i=0;i<liObj.length;i++){
document.write(`第${i+1}個li的nodeName是${liObj[i].nodeName},nodeValue是${liObj[i].nodeValue},nodeType是${liObj[i].nodeType};<br>`)
}
2019-03-12
var firthGrade = [];
infos.filter(function(index) {
return index.indexOf('大一') >= 0 && index.indexOf('女') >= 0;
})
.forEach(function (item) {
firthGrade.push(item[0]);
});
console.log(firthGrade);
infos.filter(function(index) {
return index.indexOf('大一') >= 0 && index.indexOf('女') >= 0;
})
.forEach(function (item) {
firthGrade.push(item[0]);
});
console.log(firthGrade);
2019-03-12
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Array對象 </title>
<script type="text/javascript">
var myarr1= ["我","愛","你"];
document.write(myarr1.slice(myarr1.indexOf("愛")))
</script>
</head>
<body>
</body>
</html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Array對象 </title>
<script type="text/javascript">
var myarr1= ["我","愛","你"];
document.write(myarr1.slice(myarr1.indexOf("愛")))
</script>
</head>
<body>
</body>
</html>
2019-02-27
var infos=[['小A','女',21,'大一'],['小B','男',23,'大三'],
['小C','男',24,'大四'],['小D','女',21,'大一'],
['小E','女',22,'大四'],['小F','男',21,'大一'],
['小G','女',22,'大二'],['小H','女',20,'大三'],]
for(i=0;i<infos.length;i++){
if(infos[i][1]=='女'&&infos[i][3]=='大一')
{document.write(infos[i]+'<br>'); }}
['小C','男',24,'大四'],['小D','女',21,'大一'],
['小E','女',22,'大四'],['小F','男',21,'大一'],
['小G','女',22,'大二'],['小H','女',20,'大三'],]
for(i=0;i<infos.length;i++){
if(infos[i][1]=='女'&&infos[i][3]=='大一')
{document.write(infos[i]+'<br>'); }}
2019-02-25
CSS硬傷 border margin width height.......................眼花繚亂
2019-02-25
var arr=new Array('*','##','***','&&','****','##*');
arr[7]='**' ;
//創(chuàng)建數(shù)組
alert("Arr Length:"+ arr.length);
//顯示數(shù)組長度
for(i=0;i<arr.length;i++)
{
document.write(arr[i]+'<br/>');
}
arr[7]='**' ;
//創(chuàng)建數(shù)組
alert("Arr Length:"+ arr.length);
//顯示數(shù)組長度
for(i=0;i<arr.length;i++)
{
document.write(arr[i]+'<br/>');
}
2019-02-25