获取鼠标选中文本内容

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$(document).on('mouseup',function(){
    console.log(window.getSelection().toString());
});

补充：将选中内容标识出来

$(document).on('mouseup',function(e){  
        let a = document.createElement("span");
        a.setAttribute("class","wrap");
        window.getSelection().getRangeAt(0).surroundContents(a); 
    });