标签：
json数据格式
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
var json = { name : ‘leo‘, age : 32 };
// alert( json.name );
var arrUrl = [ ‘img/1.png‘, ‘img/2.png‘, ‘img/3.png‘, ‘img/4.png‘ ];
var arrText = [ ‘小宠物‘, ‘图片二‘, ‘图片三‘, ‘面具‘ ];
var imgData = {
url : [ ‘img/1.png‘, ‘img/2.png‘, ‘img/3.png‘, ‘img/4.png‘ ],
text : [ ‘小宠物‘, ‘图片二‘, ‘图片三‘, ‘面具‘ ]
};
// alert( imgData.url[2] );
// var json2 = { name : ‘miaov‘ };
var json2 = { ‘name‘ : ‘miaov‘ };
// alert( json2.name );
// alert( json2[‘name‘] );
json2.name = ‘妙味‘;
json2[‘name‘] = ‘miaov‘;
// alert(json2.name);
var json3 = { abc : 123, xyz : ‘‘ };
// { [], [], [] } [ {}, {}, {} ]
var arr = [ { ‘name‘ : ‘TM‘, ‘age‘ : 23 }, { ‘name‘ : ‘leo‘, ‘age‘ : 32 } ];
// alert( arr[0].name + ‘今年有‘ + arr[1][‘age‘] );
var json4 = { ‘name‘ : ‘miaov‘, ‘age‘ : 3, ‘fun‘ : ‘前端开发‘ };
for ( var attr in json4 ) {
// alert( attr );
// alert( json4[attr] );
}
var json5 = {
‘url‘ : [ ‘img/1.png‘, ‘img/2.png‘, ‘img/3.png‘, ‘img/4.png‘ ],
‘text‘ : [ ‘小宠物‘, ‘图片二‘, ‘图片三‘, ‘面具‘ ]
};
// var arr = [ {}, {}, {} ];
for ( var attr in json5 ) {
for ( var i=0; i < json5[attr].length; i++ ) {
alert( json5[attr][i] );
}
}
</script>
</head>
<body>
</body>
</html>
for-in 遍历对象属性
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<script>
var str = ‘‘;
var num = 0;
for ( var attr in document ) {
str += num + ‘. ‘ + attr + ‘:‘ +document[attr] + ‘<br />‘;
num ++;
}
document.body.innerHTML = str;
</script>
</body>
</html>
for循环和for-in的使用
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
var json = {
‘url‘ : [ ‘img/1.png‘, ‘img/2.png‘, ‘img/3.png‘, ‘img/4.png‘ ],
‘text‘ : [ ‘小宠物‘, ‘图片二‘, ‘图片三‘, ‘面具‘ ]
};
var arr = [ ‘a‘, ‘b‘, ‘c‘ ];
for ( var i in arr ) {
alert( arr[i] );
}
</script>
</head>
<body>
</body>
</html>
数组的添加方法
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
var arr = [ 1,2,3 ];
// alert( arr.push( ‘abc‘ ) );
// alert( arr );
alert( arr.unshift( 0 ) ); // IE 6 7 不支持 unshift 返回值
// alert( arr );
</script>
</head>
<body>
</body>
</html>
数组的删除方法
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
var arr = [ ‘TM‘, ‘钟毅‘, ‘张森‘, ‘杜鹏‘, ‘Leo‘ ];
// alert( arr.pop() );
// alert( arr );
alert( arr.shift() );
// arr.shift();
alert( arr );
</script>
</head>
<body>
</body>
</html>
数组排队
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
var arr1 = [ 1,2,3,4,5,6 ];
// arr1.reverse();
// alert( arr1 );
var str = ‘abcdef‘;
// alert(str.split(‘‘).reverse().join(‘‘));
</script>
</head>
<body>
</body>
</html>
splice使用（功能包括：删除、替换、添加）
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
var arr = [ ‘TM‘, ‘钟毅‘, ‘张森‘, ‘杜鹏‘, ‘Leo‘ ];
// 删除、替换、添加
alert( arr.splice( 0 , 0, ‘aaaaaa‘ ) );
// arr.splice( 0, 2, ‘莫涛 or 钟毅‘ );
// alert( arr.splice( 1, 0, ‘钟毅媳妇儿~‘, ‘钟毅媳妇们~‘ ) );
alert( arr );
</script>
</head>
<body>
</body>
</html>
数组去重
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
var arr = [ 1,2,2,4,2 ];
for ( var i=0; i<arr.length; i++ ) {
for ( var j=i+1; j<arr.length; j++ ) {
if ( arr[i] == arr[j] ) {
arr.splice( j, 1 );
j--;
}
}
}
alert( arr );
</script>
</head>
<body>
</body>
</html>
sort排序使用
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
var arr = [ ‘c‘, ‘d‘, ‘a‘, ‘e‘ ];
// arr.sort();
// alert( arr );
var arr2 = [ 4,3,5,5,76,2,0,8 ];
// arr2.sort();
// alert( arr2 );
arr2.sort(function ( a, b ) {
return a - b;
});
// alert( arr2 );
var arrWidth = [ ‘345px‘, ‘23px‘, ‘10px‘, ‘1000px‘ ];
arrWidth.sort(function ( a, b ) {
return parseInt(a) - parseInt(b);
});
alert( arrWidth );
</script>
</head>
<body>
</body>
</html>
随机排序
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
var arr = [ 1,2,3,4,5,6,7,8 ];
arr.sort(function ( a, b ) {
return Math.random() - 0.5;
});
alert( arr );
// alert( Math.random() );
</script>
</head>
<body>
</body>
</html>
随机函数
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
// alert( Math.round(3.4) ); //四舍五入函数
// 0~1 : Math.round(Math.random());
// 0~10
// alert( Math.round(Math.random()*10) );
// 5~10
// alert( Math.round( Math.random()*5 + 5 ) );
// 10~20
// alert( Math.round( Math.random()*10 + 10 ) );
// 20~100
// alert( Math.round( Math.random()*80 + 20 ) );
// x ~ y
var x = 3;
var y = 49;
// alert( Math.round( Math.random()*(y-x) + x ) );
// 0~x
// alert( Math.round( Math.random()*x) );
// 1~x
alert( Math.ceil( Math.random()*x) );
// 课上小练习：
// 随机产生 100 个从 0 ~ 1000 之间不重复的整数
// var str = ‘aaasdlfjhasdlkfs‘;
// indexOf(‘s‘) —— 为数组编写该方法：indexOf(‘img/1.jpg‘)
</script>
</head>
<body>
</body>
</html>
concat方法使用
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
var arr1 = [ 1,2,3 ];
var arr2 = [ 4,5,6 ];
var arr3 = [ 7,8,9 ];
alert( arr1.concat( arr2, arr3 ) );
</script>
</head>
<body>
</body>
</html>
reverse方法使用
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
var arr1 = [ 1,2,3,4,5,6 ];
// arr1.reverse();
// alert( arr1 );
var str = ‘abcdef‘;
// alert(str.split(‘‘).reverse().join(‘‘));
</script>
</head>
<body>
</body>
</html>
标签：
原文地址：http://www.cnblogs.com/webdjk/p/5338234.html
