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JavaScript 2019 新特性
tryjs_string_trimstart
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<!DOCTYPE html> <html> <body> <h1>JavaScript Strings</h1> <h2>The trimStart() Method</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>