<!DOCTYPE html>
<html>
<body>
<h1>JavaScript 字符串</h1>
<h2>trimStart() 方法</h2>
<p id="demo"></p>
<script>
let text1 = " Hello World! ";
let text2 = text1.trimStart();
document.getElementById("demo").innerHTML =
"Length text1 = " + text1.length + "<br>Length text2 = " + text2.length;
</script>
</body>
</html>