//开关切换  无状态值切换 
    $("#swich_op").click(function(){
        console.log($(this).attr("src"));
        if($(this).attr("src") == "static/security_img/on.png"){
            $(this).attr("src","static/security_img/down.png")
        }
        else{
            $(this).attr("src","static/security_img/on.png")
        }
    })
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