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<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>三元表达式</title>
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<body>
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function createDiv(options={}){
let div = document.createElement("div");
div.style.width = options.width ? options.width : "100px";
div.style.height = options.height ? options.height : "100px";
div.style.backgroundColor = options.backgroundColor ? options.backgroundColor : "red";
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createDiv({width:"200px",height:"200px",backgroundColor:"green"})
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