{ "name": "bob", "dinner": "pizza" },
{ "name": "john", "dinner": "sushi" },
{ "name": "larry", "dinner": "hummus" }
]
people.filter(function (person) {
if(person.dinner){
console.log(person.dinner)
}
if(person.name){
console.log(person.name)
}
})
var people1 = { "name": "bob", "dinner": "pizza" }
Object.keys(people1)
console.log(Object.keys(people1))
var jsonObj = {"1" : 50,"2" : 40,"3" : 40,"4" : 30,"5" : 20,"6" : 20,"7" : 20,"8" : 20,"9" : 20, "10" : 20}
var keyAry = []
var valueAry = []
for(var key in jsonObj){
keyAry.push(key)
valueAry.push(jsonObj[key])
}
console.log(keyAry)
console.log(valueAry)
你这样存进去的是没有key的,正确的写法应该是var a=new Array({key:'1',value:"a"},{key:'2',value:"b"},{key:'3',value:"c"},{key:'4',value:"d"})
下面写了个例题
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<BODY>
<SCRIPT LANGUAGE="JavaScript">
<!--
function Map( ){
this.elements = new Array()
this.init = function( _e ){
this.elements = _e
}
this.put = function(key, value) { // 加入元素
this.elements.push({key: key, value:value})
}
this.getByValue = function( _value) { // 取出对应value
try{
for (i = 0i <this.elements.lengthi++) {
if (this.elements[i].value == _value) {
return this.elements[i].key
}
}
}catch(e) {
return null
}
}
this.getByKey = function( _key) { // 取出对应key
try{
for (i = 0i <this.elements.lengthi++) {
if (this.elements[i].key == _key) {
return this.elements[i].value
}
}
}catch(e) {
return null
}
}
}
//使用例题
var a=new Array({key:'1',value:"a"},{key:'2',value:"b"},{key:'3',value:"c"},{key:'4',value:"d"})
var value = "b"
var map = new Map()
map.init( a )
alert( map.getByValue( value ) )
//-->
</SCRIPT>
</BODY>
</HTML>
