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我需要输入 width: 100%; 一行文字（更准确地说是一个字符）：
+<input style="width: 100%;" type="tel />
好吧，如果输入是 100% 宽，那条线上就没有其他东西了
这有点你想要的吗？
http://jsfiddle.net/NVzfs/3/