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选择来自az的随机字母

如何从az中选择一个随机字母并将其单独放入html的标题中,并使其替换之前存在的任何其他字母?我不知道我所做的工作是否可行。

function randLetter( ) {

var letters =
    ("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q"
    ,"r","s","t","u","v","w","x","y","z");

var letter = letters[Math.floor(Math.random()*letters.length)];

return letter

}

$('#letter').html('letter')
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javascript jquery

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