- es6新特性
- startsWith和endsWith
- codePointAt和fromCodePoint
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>019</title>
<script type="text/javascript" src="es6-shim.js"></script>
</head>
<body>
</body>
<script type="text/javascript">
var str = "Mockingbirds don't do one thing except make music " +
"for us to enjoy. They don't eat up people's gardens, " +
"don't nest in corn cribs, " +
"they don’t do one thing but sing their hearts out for us. " +
"That's why it’s a sin to kill a mockingbird."
console.log(str.startsWith("Mockingbirds"));
console.log(str.startsWith("autos", 20));
console.log(str.endsWith("mockingbird."));
console.log(str.endsWith("kill", str.length - 15));
var cp = str.codePointAt(50);
var cp2 = str.codePointAt(51);
var cp3 = str.codePointAt(52);
var str2 = String.fromCodePoint(cp,cp2,cp3);
console.log(cp);
console.log(cp2);
console.log(cp3);
console.log(str2);
let a = 3333;
console.log(a);
</script>
</html>
