Edit in JSFiddle

var resultCon;

function MyObj() {
    this.name = 'MyObj下的name<br/>';
    
    this.doFunction = function() {
        resultCon.innerHTML += this.name;
    };
}
MyObj.prototype.name = 'prototype下的name<br/>';

window.onload = function() {
    resultCon = document.getElementById('result');
    
    var obj = new MyObj();
    obj.doFunction();
};

<div id="result">代码输出结果：<br/></div>