function myFunction(){
var a = 1;
var b = 2;
if(a>b)
{
alert("true");
}else if(2>9){
alert("false");
}else{
alert('123');
}
var x = '';
var sd = 210;
switch(sd){
case 100:x = "值为100";
break;
case 200:x = "值为200";
break;
case 300:x = "值为300";
break;
case 400:x = "值为400";
break;
case 500:x = "值为500";
break;
default:x = "其他值 ";
}
alert(''+x);
for(var i = 0; i< 5 ;i++){
document.write(i+"<br>");
}
var txt = '';
var strs = {fbane:"scone",lname:"110"};
for(c in strs){
txt = txt + strs[c];
}
alert(txt);
}
function testfor1(){
var res = '';
var ho = [1,2,3,4,5,6,7,8,9];
for(var i =0;i< ho.length;i++){
res = res+ho[i];
}
alert(res);
}
function testfor2(){
var x
var hos = [1,2,3];
for(x in hos){
alert(hos[x]+"<br/>");
}
}
function testfor3(){
var val
var hos = [1,2,3];
for(val of hos){
alert(val+"<br/>");
}
}
function testfor4(){
var val
var hos = 'sdfkdsf5fd5sa';
for(val of hos){
alert(val+"<br/>");
}
}
function testfor5(){
let iterable = new Map([["a",1],["b",2],["c",3]]);
for(let [key,value] of iterable){
alert(value+"<br/>");
}
for(let entry of iterable){
alert(entry+"<br/>");
}
}
function testfor6(){
let iterable = new Set(["a","b","c"]);
for(let entry of iterable){
alert(entry+"<br/>");
}
}
