实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
​x
 
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<!DOCTYPE html>
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<html>
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<body>
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​
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<p id="p1">Click the button to locate where "locate" first occurs.</p>
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<p id="p2">0</p>
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<button onclick="myFunction()">Try it</button>
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​
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<script>
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function myFunction()
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{
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var str=document.getElementById("p1").innerHTML;
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var n=str.indexOf("locate");
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document.getElementById("p2").innerHTML=n+1;
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}
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</script>
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​
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</body>
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</html>
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​
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