Question

    var x = document.getElementById("testingAjax");
    if (x != null) {
        var left = x.position().left;
        alert(left);
    }

为什么要打破上述法典? 该编码在<代码>var左 = x.position(.left上,有误。目标日期:

Answer 1

如果你使用j Query,你需要将任何非饰物填入美元。因此,你的法典成为:

var x = document.getElementById("testingAjax");
if (x != null) {
    var left = $(x).position().left; // x by itself is not a jQuery object. Need to pass it to $(..)
    alert(left);
}

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