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js:document.getElementById("txt1").value = "字符串"
jquery:$("#txt1").val("字符串");
js:var str = document.getElementById("txt1").value;
jquery:var str = $("#txt1").val();
js:document.getElementById("txt1").innerHTML = "字符串"
jquery:$("#txt1").html("字符串");
js:var str = document.getElementById("txt1").innerHTML;
jquery:var str = $("#txt1").html();
js:document.getElementById("txt1").style.color = "#ffffff";
jquery:$("#txt1").css("color","#ffffff");
js:var str = document.getElementById("txt1").style.color;
jquery: var str = $("#txt1").css("color");