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JavaScript 加法赋值运算符
tryjsref_oper_plusequal3
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<!DOCTYPE html> <html> <body> <h1>JavaScript Assignment</h1> <h2>Addition Assignment</h2> <h2>The += Operator</h2> <p id="demo"></p> <script> let text = "Hello "; text += "World!" document.getElementById("demo").innerHTML = "Value of text is " + text; </script> </body> </html>