trpl-zh-cn/docs/book.js

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    // Hide Rust code lines prepended with a specific character
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        buttons.prepend("<i class=\"fa fa-play play-button\"></i>");

        buttons.find(".play-button").click(function(e){
            run_rust_code(pre_block);
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});


function run_rust_code(code_block) {
    var result_block = code_block.find(".result");
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    result_block.text("Running...");

    $.ajax({
        url: "https://play.rust-lang.org/evaluate.json",
        method: "POST",
        crossDomain: true,
        dataType: "json",
        contentType: "application/json",
        data: JSON.stringify({version: "stable", optimize: "0", code: code_block.find(".language-rust").text() }),
        success: function(response){
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        }
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}